Get Ready for New PHP

WordCamp London Talk

Transcript

1. Get Ready for PHP 5.4+
   Lorna Mitchell, WordCamp London
   

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2. Some Shiny, Some Gotchas
   

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3. Magic DIR Constant (5.3)
   Instead of:
   dirname(__FILE__);
   Now you can use:
   __DIR__;
   

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4. Anonymous Functions (5.3)
   Declare a function in the place where it is used.
   (you may have seen this in JavaScript)
   

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5. Anonymous Functions
   The old way:
   $things = array("name" => "Alice",
   "colour" => "Blue",
   "origin" => "Dreams");
   function formatit($value, $key) {
   echo $key . ": " . $value . "\n";
   }
   array_walk($things, "formatit");
   

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6. Anonymous Functions
   Using an anonymous function:
   $things = array("name" => "Alice",
   "colour" => "Blue",
   "origin" => "Dreams");
   array_walk($things, function ($value, $key) {
   echo $key . ": " . $value . "\n";
   });
   

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7. Namespaces (5.3)
   Namespaces are for combining libraries in one project.
   • we keep our own code in its own namespace(s)
   • we can pick-and-mix other people's code
   • class names don't have crazy long prefixes
   • combined with PSR standards, they enable
   Composer
   

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8. Namespaced Library File
   namespace Lorna;
   class Nonsense {
   protected $words =
   array("wibble", "squeak", "howl", "pop");
   public function speak() {
   return $this->words[
   array_rand($this->words)];
   }
   }
   

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9. Namespaced Calling Code
   include 'lorna/nonsense.php';
   use Lorna\Nonsense;
   $nsense = new Nonsense();
   echo $nsense->speak();
   $other = new \StdClass();
   

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10. Register Globals is Gone (5.4)
    Upgrade PHP and see many undefined (simple)
    variables.
    To fix each undefined variable:
    • replace $username with $_GET['username']
    or $_POST['username'] in each case
    

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11. Echo Shortcut (5.4)
    PHP 5.4 removes short_open_tag config option
    • is never valid - s//• = is always valid
    = is the same as:

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12. Less Nonsense (5.4)
    Removed in PHP 5.4:
    • register_globals
    • register_long_arrays
    • safe_mode
    • magic_quotes
    • allow_call_time_pass_reference
    • y2k_compliance
    • ereg* functions
    

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13. Error Reporting: E_STRICT
    E_ALL includes E_STRICT in PHP 5.4+
    You can either:
    1. Fix your errors
    2. Turn it off again using E_ALL & ~E_STRICT
    

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14. Timezone Settings (5.4)
    PHP refuses to guess the timezone and will warn you.
    It is not safe to rely on the system's timezone settin
    You are *required* to use the date.timezone setting or
    date_default_timezone_set() function.
    In case you used any of those methods and you are stil
    warning, you most likely misspelled the timezone ident
    Fix it by setting date.timezone in php.ini:
    date.timezone = "Europe/London"
    

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15. Call Time Pass By Reference
    PHP Fatal error: Call-time pass-by-reference has been
    This error says "don't pass references in when the
    function didn't expect them, you fool"
    

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16. Call Time Pass By Reference
    You can pass by reference. Declare function:
    1 function inspire(&$person) {
    2 // be inspiring
    3 }
    Call with just $ and not &
    1 inspire($current_user);
    

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17. Easy Password Hashing (5.5)
    $pass = "secretpassword";
    $hashed = password_hash($pass, PASSWORD_DEFAULT);
    echo $hashed;
    $2y$10$Q7Rm.Cmcu4lbvI7.C2q4Z.1LLoh4C63vBSfflQt
    fjs52GxhAc.s/G
    

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18. Easy Password Hashing
    $existing_hash = '$2y$10$Q7Rm.Cmcu4lbvI7.C2q4Z.1LLoh4C
    $pass = "secretpassword";
    if(password_verify($pass, $existing_hash))
    echo "All good";
    else
    echo "Go away";
    For PHP < 5.5:
    http://github.com/ircmaxell/password_compat
    

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19. Built-in OpCache (5.5)
    Replaces APC - beware this is disabled by default.
    Turn on opcache.enable and opcache.enable_cli
    

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20. Get Ready for New PHP
    

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21. PHP Peformance
    

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22. Use PHPCodeSniffer
    Use the PHPCompatibility PHPCS standard
    Install from
    https://github.com/wimg/PHPCompatibility and
    include in your standards directory
    

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23. PHP Knows What's Deprecated
    Turn on E_DEPRECATED on an older version to see
    what's removed in the next version
    Set with: error_reporting = E_ALL
    

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24. Lint Check
    Syntax check your code with new version of PHP
    Use phing (http://www.phing.info/):
    
    
    
    
    
    
    Or try my one-liner:
    find . -name '*.php' | xargs -n1 php -l
    

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25. Serve with PHP
    Run application with PHP's webserver (5.4+)
    php -S localhost:8080
    

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26. PHP's Own Webserver
    php -S dev.project.local:8080
    -t /var/www/cool-project/web
    -c php-ini.development
    routing.php
    

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27. Use Continuous Integration
    Builds
    Use something like http://travis-ci.com to run regular
    builds
    This can run your build steps for various versions of
    PHP each time you commit
    (it's free for open source users)
    

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28. Check Your Code Is Ready
    • Use the PHPCompatibility PHPCS standard
    • Turn on E_DEPRECATED and watch the logs of
    your existing platform
    • Lint check with new version (php -l)
    • Run application with PHP's webserver
    

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29. Questions? (and resources)
    Intermediate PHP http://lrnja.net/php-video
    Contact me: @lornajane or http://lornajane.net
    

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