New Wave PHP 

Recent Versions of PHP Version Released End of Life 5.2 November 2006 January 2011 5.3 June 2009 July 2014 5.4 March 2012 September 2015 5.5 June 2013 June 2016 5.6 August 2014 August 2017 7.0 Q4 2015 Release + 3 months 

New Wave PHP 

New Wave PHP Data from http://w3techs.com 

Changes in PHP 

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 

Echo Shortcut (5.4) PHP 5.4 removes short_open_tag config option •

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 

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 settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. Fix it by setting date.timezone in php.ini: date.timezone = "Europe/London" 

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

Call Time Pass By Reference You can pass by reference. Declare function:

Traits (5.5) Traits are building blocks for classes Traits can: • build on one another • be used together • are inherited by child classes 

Traits addRecord($level, $message, $context); } } 

Traits To use a trait: log("Something went wrong"); 

DateTimeImmutable (5.5) add(new DateInterval('P4D')); print_r($d1); DateTime Object ( [date] => 2015-01-09 10:43:26 ... ) DateTime Object ( [date] => 2015-01-13 10:43:26 ... ) 

DateTimeImmutable add(new DateInterval('P4D')); print_r($d2); DateTime Object ( [date] => 2015-01-09 10:43:26 ... ) DateTime Object ( [date] => 2015-01-09 10:43:26 ... ) 

Easy Password Hashing (5.5) $pass = "secretpassword"; $hashed = password_hash($pass, PASSWORD_DEFAULT); echo $hashed; Output: $2y$10$Q7Rm.Cmcu4lbvI7.C2q4Z.1LLoh4C63vBSfflQtfjs52GxhAc.s/G (you may need to make your password columns larger) 

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_compa t 

PHP Generators (5.5) Simpler than iterators - a function returning a sequence of values.

PHP Generators Simpler than iterators - a function returning a sequence of values.

MySQL is Deprecated (5.5) The original mysql extension now emits E_DEPRECATED warnings. Instead, use: • PDO • The mysqli extension, which is similar to the original mysql one 

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

Variadic Functions (5.6) function concatenate($transform, ...$strings) { $string = ''; foreach($strings as $piece) { $string .= $piece; } return($transform($string)); } echo concatenate("strtoupper", "I'd ", "like ", 4 + 2, " apples"); 

Argument Unpacking (5.6) Let PHP unpack your args $email[] = "[email protected]"; $email[] = "Hi there"; $email[] = "Thanks for registering, hope you like it"; // old syntax mail($email[0], $email[1], $email[2]); //new syntax mail(...$email); 

Argument Unpacking Let PHP unpack your args $email[] = "Hi there"; $email[] = "Thanks for registering, hope you like it"; mail("[email protected]", ...$email); 

Namespaced Functions (5.6) Have always been able to namespace functions Can now import them, like classes include "Lib/Many/Layers/functions.php"; use function \Lib\Many\Layers\deep_func; deep_func(); 

Upgrading An Existing System 

Performance Comparison 

How To Upgrade • Turn on E_DEPRECATED and watch the logs of your existing platform • Use the PHPCompatibility PHPCS standard • Compile new PHP and run test suite • Lint check with new version (php -l) • Run application with PHP's webserver • Upgrade a test/staging platform • Go for it! 

PHP's Own Webserver (5.4) php -S localhost:8080 

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

Finding Platforms New projects should be PHP 5.5 or later. Questions to ask: • What versions of PHP are available? • Are backups included? • Which extensions are available, and can I add others? • Can I get support with my PHP setup? 

Unofficial List of Providers • Servergrove http://www.servergrove.com/ • Linode https://www.linode.com/ • Digital Ocean https://www.digitalocean.com/ • Siteground http://www.siteground.com/ • Rackspace http://rackspace.com 

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