Essential PHP 7 | PHP[World]

Presented on November 16 2016 at PHP[World], Washington DC, United States.
https://world.phparch.com/
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Overview of the most important changes introduced with PHP 7. We’ve all heard that PHP 7 is fabulous: faster than any previous PHP version and even HHVM, plus some nifty new functionality and much better exception management. But what do we need to do to make our code compatible with PHP 7? What will break and how do we avoid this?

Transcript

1. Juliette Reinders Folmer @jrf_nl Essential PHP 7
3. What Happened to PHP 6 ? • Unicode – ICU • Publications
6. How Fast ?!?!?
7. How Fast ?!?!?
8. How Fast ?!?!?
9. What Can You Expect ? New features! Less BC breaks than upgrading to 5.4! PHPNG (PHP Next-Gen) Speed !
10. When ? 7.0: December 3, 2015 Current: 7.0.13 7.1: ~November 2016 Currently on RC6
11. Version Support Today: November 16 2016
12. PHP 5.2 PHP 5.3 PHP 5.4 PHP 5.5 Requirements PHP 5.6
13. What has changed ?
14. So Long And Thanks For All The Fish MySql & MsSql extensions Ereg Posix Regex PHP 5.5 and lower
15. • dl() on fpm-fcgi • set_magic_quotes_runtime() • set_socket_blocking() • mcrypt_generic_end() • mcrypt_ecb() • mcrypt_cnc() • mcrypt_cfb() • datefmt_set_timezone_id • IntlDateFormatter::setTimeZoneID • call_user_method() • call_user_method_array() Removed Functions
16. • xsl.security_prefs • Input encoding: – iconv.input_encoding – Iconv.internal_encoding – mbstring.http_input – mbstring.http_output – mbstring.internal_encoding Removed ini Options
17. What Will Break ? Alternative PHP tags <script language="php">echo 'script tags';</script> <% echo 'ASP tags'; %>
18. What Will Break ? Numeric Hex strings Alternative PHP tags <?php echo '0xCC00F9' + 42; echo is_numeric('0xCC00F9'); // PHP 5: 13369635 / true // PHP 7: 42 / false
19. What Will Break ? Multiple default: Division by zero Numeric Hex strings Alternative PHP tags <?php switch ( $variable ) { default: echo 'default'; break; case 'a': echo 'a'; break; default: echo $variable; break; }
20. What Will Break ? Static vs $this <?php class MyClass { public $property = 'hello!'; public function example() { echo $this->property; } } MyClass::example();
21. What Will Break ? preg_replace /e Static vs $this new ... by reference Some Variable Variables <?php $a =& new stdClass;
22. Uniform Variable Syntax Syntax Old Interpretation New Interpretation $$var[‘key1’][‘key2’] ${$var[‘key1’][‘key2’]} ($$var)[‘key1’][‘key2’] $var->$prop[‘key’] $var->{$prop[‘key’]} ($var->$prop)[‘key’] $var->$prop[‘key’]() $var->{$prop[‘key’]}() ($var->$prop)[‘key’]() Class::$var[‘key’]() Class::{$var[‘key’]}() (Class::$var)[‘key’]()
23. What Will Break ? $HTTP_ RAW_ POST_ DATA Invalid octal literals list() vs string access Redefining function args
24. What Will Break ? PHP4 construc- tors
25. PHP4 Constructors <?php class MyClass { function MyClass() { // Constructor actions. } }
26. PHP4 Constructors <?php namespace MyNameSpace; class MyClass { function MyClass() { // Normal method, not a constructor. } }
27. PHP4 Constructors <?php class MyClass { function __construct() { // Constructor actions. } function MyClass() { self::construct(); } } class MyGrandChild extends ParentClass { function __construct() { MyClass::MyClass(); } }
28. What Will Break ? func_get_ args() PHP4 construc- tors <?php function example( $string ) { $string = 'oops'; $args = func_get_args(); echo $args[0]; } example( 'test' ); // PHP 5: 'test' // PHP 7: 'oops'
29. What Will Break ? func_get_ args() Reserved words PHP4 construc- tors <?php class String { }
30. What Will Break ? func_get_ args() Reserved words PHP4 construc- tors Internal array pointer vs foreach() <?php $array = array(0, 1, 2); foreach ($array as &$val) { var_dump(current($array)); } // PHP 5: 1, 2, false // PHP 7: 0, 0, 0
31. Being Forward Compatible can be as Important as Being Backwards Compatible
32. Cross-version bootstrap.php version_compare() function_exists() class_exists() method_exists() defined()  class-php53-code.php  class-php70-code.php  class-php-compat.php
33. About Shims
34. When to Use Shims ? Framework Implement early Load early Feature complete
36. In 2020..... (or thereabouts)
37. PHP5.3+ on Steriods Bind Closure on Call Group Use Declarations Anonymous Classes Generator Enhancements Assertions
38. Goodies! Spaceship Unicode Escapes Strict Typing More Exception Types More Catchable Errors Uniform Variable Syntax Null Coalesce Scalar Type Hints & Return Type Hints
39. More Goodies! Session options Preg_ replace_ callback_ array() intdiv() Expectations Closure call() Filtered unserialize() Exceptions on Fatals IntlChar Class
40. PHP 7.1 Goodies! List with keys Multi catch iterable type hint Symmetric array destructuring void return type Nullable types Negative string offset support Class constant visibility
42. • PHP 7 Compatibility Checker – https://github.com/sstalle/php7cc • PHP Compatibility Code Standard – https://github.com/wimg/PHPCompatibility/ • PHP CompatInfo – http://php5.laurent-laville.org/compatinfo/ Check Your Application
43. • Are the PHP Extensions Ready ? – https://github.com/gophp7/gophp7-ext/wiki/extensions- catalog • Need a Dev Box ? – https://github.com/rlerdorf/php7dev • PHP 7 to PHP 5.6 transphiler – https://github.com/jaytaph/Transphpile • PHP Cheatsheets – http://phpcheatsheets.com/ Useful
44. Slides will be posted to http://speakerdeck.com/jrf Please give feedback at https://joind.in/talk/aedbe Thank you ! Essential PHP 7