What's new in PHP 5.5

These are the slides from the talk delivered to the May 2013 Melbourne PHP User Group meeting

Transcript

1. What’s new in PHP 5.5 Tom Corrigan @thetommygnr Melbourne PHP Users Group May 2013 Wednesday, 22 May 13
2. Overview • What’s new • What’s gone • What’s deprecated • Current status of PHP 5.5 Wednesday, 22 May 13
3. Generators • Syntactical sugar to avoid iterator boilerplate • Introduce a new keyword yield • https://wiki.php.net/rfc/generators Wednesday, 22 May 13
4. Before generators function getLinesFromFile($fileName) { if (!$fileHandle = fopen($fileName, 'r')) { return; } $lines = []; while (false !== $line = fgets($fileHandle)) { $lines[] = $line; } fclose($fileHandle); return $lines; } $lines = getLinesFromFile($fileName); foreach ($lines as $line) { // do something with $line } Wednesday, 22 May 13
5. Generator in action function getLinesFromFile($fileName) { if (!$fileHandle = fopen($fileName, 'r')) { return; } while (false !== $line = fgets($fileHandle)) { yield $line; } fclose($fileHandle); } $lines = getLinesFromFile($fileName); foreach ($lines as $line) { // do something with $line } Wednesday, 22 May 13
6. Generator free approach function doShit($filename){ if (!$fileHandle = fopen($fileName, 'r')) { return; } while (false !== $line = fgets($fileHandle)) { // do something with $line } fclose($fileHandle); } Wednesday, 22 May 13
7. Generators - my opinion • Few use cases • Every example I found demonstrated the functionality rather than its utility • More readable alternatives Wednesday, 22 May 13
8. Finally • New addition to try...catch blocks • Code within a finally block will always be executed. Always! • Useful for closing DB connections, file handles etc • https://wiki.php.net/rfc/finally Wednesday, 22 May 13
9. The problem: $db = mysqli_connect(); try { call_some_function($db); //function may throw exceptions which we can ‘t handle } catch (Exception $e) { mysqli_close($db); throw $e; } mysql_close($db); Wednesday, 22 May 13
10. Finally: a solution $db = mysqli_connect(); try { call_some_function($db);//function may throw exceptions which we can ‘t handle } finally { mysqli_close($db); } Wednesday, 22 May 13
11. Finally block is always executed try { return 2; } finally { echo "this will be called\n"; } //this will never be called echo "you can not see me"; this will be called //return int(2) Wednesday, 22 May 13
12. Opcache • Zend Optimizer+ has been open sourced and renamed Opcache • Included by default in PHP 5.5+ • This is a big win, it’s the fastest opcode cache for PHP, between 5%-20% faster than APC • https://wiki.php.net/rfc/optimizerplus Wednesday, 22 May 13
13. What about APC? • No current plans to support PHP > 5.4 • Does it matter? • Was always behind new PHP releases by months • Opcache is faster • Opcaches ships with PHP 5.5+ Wednesday, 22 May 13
14. APCu • APC without the bytecode cache (userland caching only) • PHP API maintains BC with APC • https://github.com/krakjoe/apcu Wednesday, 22 May 13
15. DateTimeImmutable • DateTime $dt = new \DateTime(‘2013-05-21’); $dt2 = $dt->modify(‘+1 day’); echo $dt->format(‘Y-m-d’); //2013-5-22 echo $dt2->format(‘Y-m-d’); //2013-5-22 • DateTimeImmutable $dt = new \DateTimeImmutable(‘2013-05-21’); $dt2 = $dt->modify(‘+1 day’); echo $dt->format(‘Y-m-d’); //2013-5-21 echo $dt2->format(‘Y-m-d’); //2013-5-22 • Warning: Extends \DateTime, type hints won’t save you Wednesday, 22 May 13
16. Constant array and string dereferencing You can now do this: echo [“one”, “two”, “three”][1]; => “two” And this: echo “onetwothree”[1]; => “n” Wednesday, 22 May 13
17. list() inside foreach $talks = [ [ "speaker" => "Tom Corrigan", "talk" => "What’s new in PHP 5.5", ], [ "speaker" => "Rick Measham", "talk" => "Hacker tips for getting hired", ], ]; foreach ($talks as list($speaker, $talk){ echo $speaker. " on " . $talk . PHP_EOL; } // Tom Corrigan on What’s new in PHP 5.5 // Rick Measham on Hacker tips for getting hired •https://wiki.php.net/rfc/foreachlist Wednesday, 22 May 13
18. array_column() $talks = [ [ "speaker" => "Tom Corrigan", "talk" => "What’s new in PHP 5.5", ], [ "speaker" => "Rick Measham", "talk" => "Hacker tips for getting hired", ], ]; $speakers = array_column($talks, "speaker"); //array [0] Tom Corrigan [1] Rick Measham • https://wiki.php.net/rfc/array_column Wednesday, 22 May 13
19. Password hash • Colby did a talk last month • Use it today in PHP 5.3.7+ https://github.com/ircmaxell/ password_compat Wednesday, 22 May 13
20. Tons of new stuff in ext/intl • Didn’t get time to cover this one, sorry! • See: http://www.php.net/manual/en/migration55.classes.php Wednesday, 22 May 13
21. Removed/changed • No Windows XP or 2003 support • Case insensitivity no longer locale specific • Logo functions removed: php_logo_guid(), php_egg_logo_guid() etc • Changes to pack() and unpack() BC BREAK • http://www.php.net/manual/en/migration55.incompatible.php Wednesday, 22 May 13
22. Deprecated • ext/mysql !!!! • preg_replace() /e modifier, use preg_replace_callback() (good!) • IntlDateFormatter::setTimeZoneID() and datefmt_set_timezone_id() • some mcrypt functions • http://www.php.net/manual/en/migration55.deprecated.php Wednesday, 22 May 13
23. Current status • First Release Candidate: 9 May • Second RC due out on 23rd May • Expected stable release soon Wednesday, 22 May 13
24. Questions? Wednesday, 22 May 13