[php[tek] 2017] PHP 7.NEXT: The New Bits

PHP 7.0 is old news, PHP 7.1 is the new hotness. As the first point release in the 7.x series, 7.1 will set the tone for future releases of the highly successful PHP 7.

PHP 7.1 is shaping up to be an even more feature-filled release than 7.0, join me and walk through what's coming up in the most exciting release yet.

Transcript

1. P H P 7 . N E X T : T H E N E W B I T S
   

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2. D A V E Y S H A F I K
   • Developer
   • Author
   • Open Source Contributor
   • @dshafik
   

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3. h t t p s : / / d e v e l o p e r . a k a m a i . c o m
   

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4. Let’s start a conversation about
   mental health in tech
   mhprompt.org
   

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5. R E L E A S E M A N A G E R
   

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6. P H P I S D E A D ?
   CC-BY 2.0: Nana B Agyei
   

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7. W H A T D O E S P R O G R E S S L O O K L I K E ?
   CC-BY 2.0: damon jah
   

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8. C U R R E N T U S A G E
   

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9. P H P U S A G E
   Source: w3techs
   

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10. P H P V E R S I O N S
    Source: composer (seld.be)
    

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11. P H P M A J O R V E R S I O N S
    5.x
    46%
    7.x
    54%
    

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12. P H P I S E V O L V I N G
    CC-BY 2.0: Duncan Hull
    

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13. S H O R T E C H O T A G S
    P H P 5 . 4
    

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14. B I N A R Y N U M B E R S
    P H P 5 . 4
    

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15. S H O R T A R R A Y S Y N T A X
    P H P 5 . 4
    

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16. A R R A Y D E R E F E R E N C I N G
    P H P 5 . 4
    

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17. C L O S U R E $ T H I S B I N D I N G
    P H P 5 . 4
    

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18. C A L L A B L E T Y P E H I N T
    P H P 5 . 4
    

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19. T R A I T S
    P H P 5 . 4
    

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20. B U I L T I N C L I S E R V E R
    P H P 5 . 4
    

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21. L I S T S U P P O R T I N F O R E A C H
    P H P 5 . 5
    

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22. A R B I T R A R Y E X P R E S S I O N S U P P O R T
    F O R E M P T Y ( )
    P H P 5 . 5
    

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23. S T R I N G / A R R A Y D E R E F E R E N C I N G
    P H P 5 . 5
    

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24. F I N A L L Y B L O C K S
    P H P 5 . 5
    

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25. E X T / P A S S W O R D
    P H P 5 . 5
    

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26. G E N E R A T O R S
    P H P 5 . 5
    

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27. L A N G U A G E S P E C I F I C A T I O N
    T H A N K S F A C E B O O K !
    

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28. E X P O N E N T O P E R A T O R ( T _ P O W )
    P H P 5 . 6
    

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29. C O N S T A N T S C A L A R E X P R E S S I O N S
    P H P 5 . 6
    

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30. P H P D B G
    P H P 5 . 6
    

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31. I M P O R T F U N C T I O N S / C O N S T A N T S
    P H P 5 . 6
    

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32. V A R I A D I C S
    P H P 5 . 6
    

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33. A R G U M E N T U N P A C K I N G ( S P L A T )
    P H P 5 . 6
    

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34. R E M O V E A L T E R N A T I V E P H P T A G S
    P H P 7 . 0
    

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35. R E M O V E P O S I X R E G E X
    P H P 7 . 0
    

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36. R E M O V E E X T / M Y S Q L
    P H P 7 . 0
    

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37. 2 . 4 X F A S T E R
    P H P 7 . 0
    

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38. A B S T R A C T S Y N T A X T R E E
    P H P 7 . 0
    

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39. U N I F O R M V A R I A B L E S Y N T A X
    P H P 7 . 0
    

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40. E N G I N E E X C E P T I O N S
    P H P 7 . 0
    

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41. U N I C O D E E S C A P E S Y N T A X
    P H P 7 . 0
    

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42. N U L L C O A L E S C E O P E R A T O R
    P H P 7 . 0
    

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43. B I N D C L O S U R E O N C A L L
    P H P 7 . 0
    

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44. G R O U P U S E D E C L A R A T I O N S
    P H P 7 . 0
    

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45. G E N E R A T O R D E L E G A T I O N
    P H P 7 . 0
    

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46. G E N E R A T O R R E T U R N V A L U E S
    P H P 7 . 0
    

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47. A N O N Y M O U S C L A S S E S
    P H P 7 . 0
    

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48. S C A L A R T Y P E H I N T S
    P H P 7 . 0
    

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49. R E T U R N H I N T S
    P H P 7 . 0
    

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50. S T R I C T T Y P E S
    P H P 7 . 0
    

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51. S P A C E S H I P O P E R A T O R
    P H P 7 . 0
    

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52. C O M B I N E D C O M P A R I S O N O P E R A T O R
    P H P 7 . 0
    

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53. P R E S E N T D A Y
    Credit: NASA/KSC
    

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55. T O O F E W A R G U M E N T S E X C E P T I O N
    

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56. T O O F E W A R G U M E N T S E X C E P T I O N
    • Throw an exception when too few arguments are passed to a user
    defined function/method regardless of strict types
    • Backwards compatibility break
    

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57. function hello($whom)
    {
    echo "Hello $whom";
    }
    hello();
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    5
    6
    T O O F E W A R G U M E N T S E X C E P T I O N
    

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58. function hello($whom)
    {
    echo "Hello $whom";
    }
    hello();
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    4
    5
    6
    T O O F E W A R G U M E N T S E X C E P T I O N
    

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59. function hello($whom)
    {
    echo "Hello $whom";
    }
    hello();
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    2
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    4
    5
    6
    T O O F E W A R G U M E N T S E X C E P T I O N
    

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60. function hello($whom)
    {
    echo "Hello $whom";
    }
    hello();
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    2
    3
    4
    5
    6
    T O O F E W A R G U M E N T S E X C E P T I O N
    

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61. function hello($whom)
    {
    echo "Hello $whom";
    }
    hello();
    1
    2
    3
    4
    5
    6
    T O O F E W A R G U M E N T S E X C E P T I O N
    Warning: Missing argument 1 for hello(), called
    in on line 6 and defined in on
    line 1
    

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62. function hello($whom)
    {
    echo "Hello $whom";
    }
    hello();
    1
    2
    3
    4
    5
    6
    T O O F E W A R G U M E N T S E X C E P T I O N
    Notice: Undefined variable: what in on
    line 4
    Hello
    

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63. T O O F E W A R G U M E N T S E X C E P T I O N
    1
    2
    3
    4
    5
    6
    function hello($whom)
    {
    echo "Hello $whom";
    }
    hello();
    

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64. T O O F E W A R G U M E N T S E X C E P T I O N
    function hello($whom)
    {
    echo "Hello $whom";
    }
    hello();
    1
    2
    3
    4
    5
    6
    Fatal error: Uncaught ArgumentCountError: Too
    few arguments to function hello(), 0 passed in
    on line 6 and exactly 1 expected in
    :1
    

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65. T O O F E W A R G U M E N T S E X C E P T I O N
    function hello($whom)
    {
    echo "Hello $whom";
    }
    try {
    hello();
    } catch (\ArgumentCountError $e) {
    // Handle exception
    }
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    2
    3
    4
    5
    6
    7
    8
    9
    10
    

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66. T O O F E W A R G U M E N T S E X C E P T I O N
    function hello($whom)
    {
    echo "Hello $whom";
    }
    try {
    hello();
    } catch (\ArgumentCountError $e) {
    // Handle exception
    }
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    

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67. T O O F E W A R G U M E N T S E X C E P T I O N
    function hello($whom, $when)
    {
    echo "Hello $whom, have a good $when";
    }
    try {
    $args = ['World'];
    hello(... $args);
    } catch (\ArgumentCountError $e) {
    // Handle exception
    }
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    

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68. T O O F E W A R G U M E N T S E X C E P T I O N
    function hello($whom, $when)
    {
    echo "Hello $whom, have a good $when";
    }
    try {
    $args = ['World'];
    hello(... $args);
    } catch (\ArgumentCountError $e) {
    // Handle exception
    }
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    

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69. E X C E P T I O N H I E R A R C H Y
    \Throwable interface
    ├── \Exception implements \Throwable
    └── \Error implements \Throwable
    ├── \TypeError extends \Error
    ├── \ParseError extends \Error
    └── \AssertionError extends \Error
    

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70. E X C E P T I O N H I E R A R C H Y
    \Throwable interface
    ├── \Exception implements \Throwable
    └── \Error implements \Throwable
    ├── \TypeError extends \Error
    │ └── \ArgumentCountError extends \TypeError
    ├── \ParseError extends \Error
    └── \AssertionError extends \Error
    

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71. N E G A T I V E S T R I N G O F F S E T S
    

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72. N E G A T I V E S T R I N G O F F S E T S
    • Consistently support negative string offsets
    • Similar to substr()
    • In string character accessors
    • Internal functions
    

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73. N E G A T I V E S T R I N G O F F S E T S
    $path = "/path/to/somewhere/";
    if (substr($path, -1) !== '/') {
    $path = substr($path, 0, -1);
    }
    

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74. N E G A T I V E S T R I N G O F F S E T S
    $path = "/path/to/somewhere/";
    if ($path[-1] === '/') {
    $path = substr($path, 0, -1);
    }
    

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75. N E G A T I V E S T R I N G O F F S E T S
    $path = "/path/to/somewhere/";
    if ($path{-1} === '/') {
    $path = substr($path, 0, -1);
    }
    

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76. S E T C H A R A C T E R S
    $string = "abc";
    $string[-2] = "z";
    // $string == "azc"
    

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77. C H E C K L E N G T H
    if (strlen($_POST['password']) < 8) {
    // Do something
    }
    if (!isset($_POST['password'][7])) {
    // Do something
    }
    if (!isset($_POST['password'][-8])) {
    // Do something
    }
    

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78. if (strlen($_POST['password']) < 8) {
    // Do something
    }
    if (!isset($_POST['password'][7])) {
    // Do something
    }
    if (!isset($_POST['password'][-8])) {
    // Do something
    }
    C H E C K L E N G T H
    

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79. if (strlen($_POST['password']) < 8) {
    // Do something
    }
    if (!isset($_POST['password'][7])) {
    // Do something
    }
    if (!isset($_POST['password'][-8])) {
    // Do something
    }
    C H E C K L E N G T H
    

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80. F U N C T I O N S U P P O R T
    strpos()
    stripos()
    substr_count()
    grapheme_strpos()
    grapheme_stripos()
    grapheme_extract()
    iconv_strpos()
    file_get_contents()
    mb_strimwidth()
    mb_ereg_search_setpos()
    mb_strpos()
    mb_stripos()
    

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81. C L O S U R E F R O M C A L L A B L E
    

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82. C L O S U R E F R O M C A L L A B L E
    class Closure {
    public static function fromCallable(callable $callable): Closure
    {
    ...
    }
    }
    

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83. C L O S I N G O V E R S C O P E
    

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84. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return [$this, 'emailValidation'];
    }
    return [$this, 'genericValidation'];
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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85. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return [$this, 'emailValidation'];
    }
    return [$this, 'genericValidation'];
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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86. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return [$this, 'emailValidation'];
    }
    return [$this, 'genericValidation'];
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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87. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return [$this, 'emailValidation'];
    }
    return [$this, 'genericValidation'];
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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88. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return [$this, 'emailValidation'];
    }
    return [$this, 'genericValidation'];
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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89. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return [$this, 'emailValidation'];
    }
    return [$this, 'genericValidation'];
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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90. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return [$this, 'emailValidation'];
    }
    return [$this, 'genericValidation'];
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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91. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return [$this, 'emailValidation'];
    }
    return [$this, 'genericValidation'];
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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92. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return [$this, 'emailValidation'];
    }
    return [$this, 'genericValidation'];
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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93. C L O S I N G O V E R S C O P E
    Fatal error: Uncaught Error: Call to private
    method Validator::emailValidation() from
    context '' in :
    

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94. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return [$this, 'emailValidation'];
    }
    return [$this, 'genericValidation'];
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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95. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return [$this, 'emailValidation'];
    }
    return [$this, 'genericValidation'];
    }
    public function emailValidation($userData) {...}
    public function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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96. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return [$this, 'emailValidation'];
    }
    return [$this, 'genericValidation'];
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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97. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return Closure::fromCallable([$this, 'emailValidation']);
    }
    return Closure::fromCallable([$this, 'genericValidation']);
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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98. C L O S I N G O V E R S C O P E
    class Validator {
    public function getValidatorCallback($validationType) {
    if ($validationType == 'email') {
    return Closure::fromCallable([$this, 'emailValidation']);
    }
    return Closure::fromCallable([$this, 'genericValidation']);
    }
    private function emailValidation($userData) {...}
    private function genericValidation($userData) {...}
    }
    $validator = new Validator();
    $callback = $validator->getValidatorCallback('email');
    $callback($userData);
    

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99. B E T T E R E R R O R H A N D L I N G
    

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100. B E T T E R E R R O R H A N D L I N G
     class Validator {
     public function getValidatorCallback($validationType) {
     if ($validationType == 'email') {
     return Closure::fromCallable([$this, 'emailValidation']);
     }
     return Closure::fromCallable([$this, 'genericValidation']);
     }
     private function emailValidation($userData) {...}
     private function genericValidation($userData) {...}
     }
     $validator = new Validator();
     $callback = $validator->getValidatorCallback('email');
     $callback($userData);
     

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101. B E T T E R E R R O R H A N D L I N G
     class Validator {
     public function getValidatorCallback($validationType) {
     if ($validationType == 'email') {
     return Closure::fromCallable([$this, 'emailValdation']);
     }
     return Closure::fromCallable([$this, 'genericValidation']);
     }
     private function emailValidation($userData) {...}
     private function genericValidation($userData) {...}
     }
     $validator = new Validator();
     $callback = $validator->getValidatorCallback('email');
     $callback($userData);
     

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102. B E T T E R E R R O R H A N D L I N G
     TypeError: Failed to create closure from
     callable: class 'Validator' does not have a
     method 'emailValdation' in :
     

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103. B E T T E R E R R O R H A N D L I N G
     TypeError: Failed to create closure from
     callable: function 'foo' not found or invalid
     function name in :
     

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104. C L A S S C O N S T A N T V I S I B I L I T Y
     

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105. C L A S S C O N S T A N T V I S I B I L I T Y
     class MyClass {
     const MY_CONSTANT = 0;
     const MY_OTHER_CONSTANT = 1;
     const MY_FAVORITE_CONSTANT = 2;
     const FOO = 1, BAR = 2;
     }
     

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106. C L A S S C O N S T A N T V I S I B I L I T Y
     class MyClass {
     public const MY_CONSTANT = 0;
     protected const MY_OTHER_CONSTANT = 1;
     private const MY_FAVORITE_CONSTANT = 2;
     private const FOO = 1, BAR = 2;
     }
     

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107. C L A S S C O N S T A N T V I S I B I L I T Y
     class MyClass {
     public const MY_CONSTANT = 0;
     protected const MY_OTHER_CONSTANT = 1;
     private const MY_FAVORITE_CONSTANT = 2;
     private const FOO = 1, BAR = 2;
     }
     

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108. C L A S S C O N S T A N T V I S I B I L I T Y
     class MyClass {
     public const MY_CONSTANT = 0;
     protected const MY_OTHER_CONSTANT = 1;
     private const MY_FAVORITE_CONSTANT = 2;
     private const FOO = 1, BAR = 2;
     }
     

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109. C L A S S C O N S T A N T V I S I B I L I T Y
     class MyClass {
     public const MY_CONSTANT = 0;
     protected const MY_OTHER_CONSTANT = 1;
     private const MY_FAVORITE_CONSTANT = 2;
     private const FOO = 1, BAR = 2;
     }
     

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110. I N T E R F A C E C O N S T A N T V I S I B I L I T Y
     interface MyInterface {
     public const MY_CONSTANT = 0;
     protected const MY_OTHER_CONSTANT = 1;
     private const MY_FAVORITE_CONSTANT = 2;
     private const FOO = 1, BAR = 2;
     }
     

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111. E N H A N C E M E N T S T O R E F L E C T I O N
     • Added ReflectionClass->getReflectionConstant()
     • Added ReflectionClass->getReflectionConstants()
     • Both return ReflectionClassConstant instances
     

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112. E N H A N C E M E N T S T O R E F L E C T I O N
     class ReflectionClassConstant {
     public function getName() { }
     public function getValue() { }
     public function isPublic() { }
     public function isPrivate() { }
     public function isProtected() { }
     public function getModifiers() { }
     public function getDeclaringClass() { }
     public function getDocComment() { }
     }
     

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113. C A T C H I N G M U L T I P L E E X C E P T I O N S
     

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114. C A T C H I N G M U L T I P L E E X C E P T I O N S
     try {
     ...
     } catch (\PDOException $e) {
     \My\App::renderError(500);
     } catch (\My\RequestException $e) {
     \My\App::renderError(500);
     } catch (\My\RequestMethodException $e) {
     \My\App::renderError(405);
     }
     

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115. C A T C H I N G M U L T I P L E E X C E P T I O N S
     try {
     ...
     } catch (\PDOException $e) {
     \My\App::renderError(500);
     } catch (\My\RequestException $e) {
     \My\App::renderError(500);
     } catch (\My\RequestMethodException $e) {
     \My\App::renderError(405);
     }
     

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116. C A T C H I N G M U L T I P L E E X C E P T I O N S
     try {
     ...
     } catch (\PDOException $e) {
     \My\App::renderError(500);
     } catch (\My\RequestException $e) {
     \My\App::renderError(500);
     } catch (\My\RequestMethodException $e) {
     \My\App::renderError(405);
     }
     

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117. C A T C H I N G M U L T I P L E E X C E P T I O N S
     try {
     ...
     } catch (\PDOException $e) {
     \My\App::renderError(500);
     } catch (\My\RequestException $e) {
     \My\App::renderError(500);
     } catch (\My\RequestMethodException $e) {
     \My\App::renderError(405);
     }
     

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118. C A T C H I N G M U L T I P L E E X C E P T I O N S
     try {
     ...
     } catch (\PDOException $e) {
     \My\App::renderError(500);
     } catch (\My\RequestException $e) {
     \My\App::renderError(500);
     } catch (\My\RequestMethodException $e) {
     \My\App::renderError(405);
     }
     

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119. C A T C H I N G M U L T I P L E E X C E P T I O N S
     try {
     ...
     } catch (\PDOException | \My\RequestException $e) {
     \My\App::renderError(500);
     } catch (\My\RequestMethodException $e) {
     \My\App::renderError(405);
     }
     

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120. L I S T ( ) I M P R O V E M E N T S
     

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121. S P E C I F Y I N G K E Y S I N L I S T ( )
     

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122. S Y D N E Y
     

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123. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '33.8688° S',
     'long' => '151.2093° E'
     ];
     list($lat, $long) = $coords;
     var_dump($lat, $long);
     

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124. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '33.8688° S',
     'long' => '151.2093° E'
     ];
     list($lat, $long) = $coords;
     var_dump($lat, $long);
     Notice: Undefined offset: 0
     Notice: Undefined offset: 1
     

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125. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '33.8688° S',
     'long' => '151.2093° E'
     ];
     list($lat, $long) = $coords;
     var_dump($lat, $long);
     $lat === NULL
     $long === NULL
     

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126. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '33.8688° S',
     'long' => '151.2093° E'
     ];
     list($lat, $long) = $coords;
     var_dump($lat, $long);
     

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127. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '33.8688° S',
     'long' => '151.2093° E'
     ];
     list('lat' => $lat, 'long' => $long) = $coords;
     var_dump($lat, $long);
     

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128. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '33.8688° S',
     'long' => '151.2093° E'
     ];
     list('lat' => $lat, 'long' => $long) = $coords;
     var_dump($lat, $long);
     $lat === '33.8688° S'
     $long === '151.2093° E'
     

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129. S I N G A P O R E
     

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130. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '1.3521° N',
     'long' => '103.8198° E'
     ];
     list($lat, $long) = $coords;
     var_dump($lat, $long);
     

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131. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '1.3521° N',
     'long' => '103.8198° E'
     ];
     list($lat, $long) = $coords;
     var_dump($lat, $long);
     Notice: Undefined offset: 0
     Notice: Undefined offset: 1
     

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132. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '1.3521° N',
     'long' => '103.8198° E'
     ];
     list($lat, $long) = $coords;
     var_dump($lat, $long);
     $lat === NULL
     $long === NULL
     

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133. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '1.3521° N',
     'long' => '103.8198° E'
     ];
     list($lat, $long) = $coords;
     var_dump($lat, $long);
     

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134. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '1.3521° N',
     'long' => '103.8198° E'
     ];
     list('lat' => $lat, 'long' => $long) = $coords;
     var_dump($lat, $long);
     

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135. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '1.3521° N',
     'long' => '103.8198° E'
     ];
     list('lat' => $lat, 'long' => $long) = $coords;
     var_dump($lat, $long);
     $lat === '1.3521° N'
     $long === '103.8198° E'
     

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136. A T L A N T A
     

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137. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '33.7490° N',
     'long' => '84.3880° W'
     ];
     list($lat, $long) = $coords;
     var_dump($lat, $long);
     

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138. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '33.7490° N',
     'long' => '84.3880° W'
     ];
     list($lat, $long) = $coords;
     var_dump($lat, $long);
     Notice: Undefined offset: 0
     Notice: Undefined offset: 1
     

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139. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '33.7490° N',
     'long' => '84.3880° W'
     ];
     list($lat, $long) = $coords;
     var_dump($lat, $long);
     $lat === NULL
     $long === NULL
     

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140. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '33.7490° N',
     'long' => '84.3880° W'
     ];
     list($lat, $long) = $coords;
     var_dump($lat, $long);
     

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141. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '33.7490° N',
     'long' => '84.3880° W'
     ];
     list('lat' => $lat, 'long' => $long) = $coords;
     var_dump($lat, $long);
     

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142. S P E C I F Y I N G K E Y S I N L I S T ( )
     $coords = [
     'lat' => '33.7490° N',
     'long' => '84.3880° W'
     ];
     list('lat' => $lat, 'long' => $long) = $coords;
     var_dump($lat, $long);
     $lat === '33.7490° N’
     $long === '84.3880° W'
     

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143. S K I P P I N G N U M E R I C K E Y S
     

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144. S K I P P I N G N U M E R I C K E Y S
     list(
     ,
     $lat,
     $long,
     ,
     ,
     $name
     ) = getLocation();
     

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145. S K I P P I N G N U M E R I C K E Y S
     list(
     ,
     $lat,
     $long,
     ,
     ,
     $name
     ) = getLocation();
     

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146. S K I P P I N G N U M E R I C K E Y S
     list(
     1 => $lat,
     2 => $long,
     5 => $name
     ) = getLocation();
     

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147. S H O R T L I S T ( ) S Y N T A X
     

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148. S H O R T L I S T ( ) S Y N T A X
     list('lat' => $lat, 'long' => $long) = $coords;
     

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149. S H O R T L I S T ( ) S Y N T A X
     ['lat' => $lat, 'long' => $long] = $coords;
     

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150. S H O R T L I S T ( ) S Y N T A X : M U T U A L L Y E X C L U S I V E S Y N T A X
     // This is not allowed:
     list([$a, $b], [$c, $d]) = [[1, 2], [3, 4]];
     // This is also not allowed:
     [list($a, $b), list($c, $d)] = [[1, 2], [3, 4]];
     // This, however, is allowed:
     [[$a, $b], [$c, $d]] = [[1, 2], [3, 4]];
     // This also:
     list(list($a, $b), list($c, $d)) = [[1, 2], [3, 4]];
     

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151. I T E R A B L E P S U E D O T Y P E
     

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152. I T E R A B L E P S U E D O T Y P E
     • Similar to callable but values you can foreach, or yield
     • Accepts any array, or object that implements Traversable
     • SPL Iterators
     • Generators
     • Can be used for return value
     • Not generic objects
     

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153. I T E R A B L E P S U E D O T Y P E
     function enumerate(iterable $args) {
     foreach ($args as $arg) {
     echo $args;
     }
     }
     

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154. I T E R A B L E P S U E D O T Y P E
     function enumerate(iterable $args) {
     foreach ($args as $arg) {
     echo $args;
     }
     }
     

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155. I T E R A B L E P S U E D O T Y P E : R E T U R N T Y P E
     function compactor(... $args): iterable {
     return $args;
     }
     

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156. I T E R A B L E P S U E D O T Y P E : R E T U R N T Y P E
     function compactor(... $args): iterable {
     return $args;
     }
     

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157. I T E R A B L E P S U E D O T Y P E : G E N E R A T O R S
     function compactor(... $args): iterable {
     foreach ($args as $arg) {
     yield $arg;
     }
     }
     

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158. A D D S I S _ I T E R A B L E ( ) F U N C T I O N
     // true
     is_iterable([1, 2, 3]);
     is_iterable(new ArrayIterator([1, 2, 3]));
     is_iterable((function () { yield 1; })());
     // false
     is_iterable(1);
     is_iterable("Hello World");
     is_iterable(new stdClass());
     

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159. V O I D R E T U R N T Y P E
     

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160. V O I D R E T U R N T Y P E
     • PHP functions implicitly return null
     • There is a semantic difference between returning null, and
     returning nothing (or not returning)
     • Void enforces this behavior
     • Can only be used as a return type
     • Cannot be changed in sub-classes
     

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161. function return_nothing(): void {
     return null;
     }
     V O I D R E T U R N T Y P E
     

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162. function return_nothing(): void {
     return null;
     }
     V O I D R E T U R N T Y P E
     

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163. function return_nothing(): void {
     return null;
     }
     V O I D R E T U R N T Y P E
     

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164. V O I D R E T U R N T Y P E
     function return_nothing(): void {
     return null;
     }
     Fatal error: A void function must not return a
     value (did you mean "return;" instead of
     "return null;"?)
     

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165. V O I D R E T U R N T Y P E
     function return_nothing(): void {
     return "nothing";
     }
     Fatal error: A void function must not return a
     value
     

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166. V O I D R E T U R N T Y P E
     function return_nothing(): void {
     return;
     }
     // or
     function return_nothing(): void {
     // no return
     }
     

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167. N U L L A B L E T Y P E S
     

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168. N U L L A B L E T Y P E S
     • Allow specified type, or null
     • Requires an explicit null, doesn’t default to null
     • Works for Arguments & Return Types
     • Prefix type with a ? (question mark)
     

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169. function hello(string $whom)
     {
     echo "Hello " . ($whom ?? "World");
     }
     hello();
     N U L L A B L E T Y P E S
     

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170. function hello(string $whom)
     {
     echo "Hello " . ($whom ?? "World");
     }
     hello();
     N U L L A B L E T Y P E S
     

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171. function hello(string $whom)
     {
     echo "Hello " . ($whom ?? "World");
     }
     hello();
     N U L L A B L E T Y P E S
     

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172. N U L L A B L E T Y P E S
     function hello(string $whom)
     {
     echo "Hello " . ($whom ?? "World");
     }
     hello();
     Fatal error: Uncaught ArgumentCountError: Too
     few arguments to function hello(), 0 passed in
     on line 6 and exactly 1 expected in
     :1
     

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173. N U L L A B L E T Y P E S
     function hello(string $whom = null)
     {
     echo "Hello " . ($whom ?? "World");
     }
     hello();
     

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174. N U L L A B L E T Y P E S
     function hello(string $whom = null)
     {
     echo "Hello " . ($whom ?? "World");
     }
     hello();
     

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175. function hello(?string $whom)
     {
     echo "Hello " . ($whom ?? "World");
     }
     hello();
     N U L L A B L E T Y P E S
     

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176. function hello(?string $whom)
     {
     echo "Hello " . ($whom ?? "World");
     }
     hello();
     N U L L A B L E T Y P E S
     

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177. N U L L A B L E T Y P E S
     function hello(?string $whom)
     {
     echo "Hello " . ($whom ?? "World");
     }
     hello();
     Fatal error: Uncaught ArgumentCountError: Too
     few arguments to function hello(), 0 passed in
     on line 6 and exactly 1 expected in
     :1
     

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178. N U L L A B L E T Y P E S
     function hello(?string $whom)
     {
     echo "Hello " . ($whom ?? "World");
     }
     hello(null);
     

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179. N U L L A B L E T Y P E S
     function hello(?string $whom = null)
     {
     echo "Hello " . ($whom ?? "World");
     }
     hello(null);
     

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180. N U L L A B L E T Y P E S
     function hello(?string $whom = null)
     {
     echo "Hello " . ($whom ?? "World");
     }
     hello();
     

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181. N U L L A B L E R E T U R N T Y P E S
     

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182. N U L L A B L E T Y P E S
     function hello(?string $whom): string
     {
     if ($whom !== null) {
     return "Hello $whom";
     }
     }
     echo hello("World"); // Hello World
     

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183. function hello(?string $whom): string
     {
     if ($whom !== null) {
     return "Hello $whom";
     }
     }
     echo hello("World"); // Hello World
     N U L L A B L E T Y P E S
     

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184. function hello(?string $whom): string
     {
     if ($whom !== null) {
     return "Hello $whom";
     }
     }
     echo hello("World"); // Hello World
     N U L L A B L E T Y P E S
     

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185. N U L L A B L E T Y P E S
     function hello(?string $whom): string
     {
     if ($whom !== null) {
     return "Hello $whom";
     }
     }
     echo hello(null);
     

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186. N U L L A B L E T Y P E S
     TypeError: Return value of hello() must be of
     the type string, none returned
     

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187. N U L L A B L E T Y P E S
     function hello(?string $whom): string
     {
     if ($whom !== null) {
     return "Hello $whom";
     }
     }
     echo hello(null);
     

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188. N U L L A B L E T Y P E S
     function hello(?string $whom): ?string
     {
     if ($whom !== null) {
     return "Hello $whom";
     }
     }
     echo hello(null);
     

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189. N U L L A B L E T Y P E S
     TypeError: Return value of hello() must be of
     the type string, none returned
     

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190. N U L L A B L E T Y P E S
     function hello(?string $whom): ?string
     {
     if ($whom !== null) {
     return "Hello $whom";
     }
     }
     echo hello(null);
     

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191. N U L L A B L E T Y P E S
     function hello(?string $whom): ?string
     {
     if ($whom !== null) {
     return "Hello $whom";
     }
     return;
     }
     echo hello(null);
     

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192. N U L L A B L E T Y P E S
     Fatal error: A function with return type must
     return a value (did you mean "return null;"
     instead of "return;"?)
     

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193. N U L L A B L E T Y P E S
     function hello(?string $whom): ?string
     {
     if ($whom !== null) {
     return "Hello $whom";
     }
     return;
     }
     echo hello(null);
     

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194. N U L L A B L E T Y P E S
     function hello(?string $whom): ?string
     {
     if ($whom !== null) {
     return "Hello $whom";
     }
     return null;
     }
     echo hello(null); // null
     

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195. C U R R E N T : P H P 7 . 1 . 5
     

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196. B E Y O N D P H P 7 . 1
     

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197. View Slide

198. C U R R E N T L Y 1 5 R F C S I M P L E M E N T E D
     

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199. 8 M O R E A C C E P T E D
     ( A N D O N E F O R P H P 8 . 0 ! )
     

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200. 1 4 M O R E I N D I S C U S S I O N
     ( A N D A N O T H E R O N E F O R P H P 8 . 0 ! )
     

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201. W E W A N T Y O U !
     Credit: NASA
     

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202. I N S U M M A R Y
     

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203. I S G R E A T !
     

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204. C O M I N G S O O N !
     

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205. T H E F U T U R E I S A W E S O M E !
     CC-BY-SA: Steven Gerner
     

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206. F E E D B A C K
     Feedback:
     Twitter:
     Email:
     Slides:
     https://joind.in/talk/
     @dshafik
     dshafik@akamai.com
     http://daveyshafik.com/slides
     f33ff
     

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