Php 5.6 From the Inside Out
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This document summarizes the key changes and new features in PHP 5.6, which was released in August 2014. It provides details on the release process and timeline. Some major additions in 5.6 included constant scalar expressions, variadic functions, argument unpacking, and the power operator. Other improvements included better SSL/TLS support, the new phpdbg debugging tool, and performance enhancements. The document also outlines some backwards incompatible changes and deprecated features.
![BC breaks
<?php
class C {
const ONE = 1;
public $array = [
self::ONE => 'foo',
'bar',
'quux',
];
}
count((new C)->array); // 2 on <=5.5 but 3 on >=5.6
?>](https://image.slidesharecdn.com/php5-141125121606-conversion-gate02/85/Php-5-6-From-the-Inside-Out-10-320.jpg)
![Argument Unpacking
<?php
function add($a, $b, $c) {
return $a + $b + $c;
}
$operators = [2, 3];
echo add(1, ...$operators); // 6
?>](https://image.slidesharecdn.com/php5-141125121606-conversion-gate02/85/Php-5-6-From-the-Inside-Out-14-320.jpg)
Php 5.6 From the Inside Out
- 1. PHP 5.6 From The Inside Out
- 2. Introduction ● Ferenc Kovacs ○ DevOps guy from Budapest, Hungary ○ Infrastructure Engineer at http://www.ustream.tv/ ○ Volunteer for the PHP project since 2011 ○ Release Manager for PHP 5.6 with Julien Pauli
- 3. History of PHP 5.6 ● 2012-11-09: First commit ● 2013-11-06: PHP-5.6 branched out ● 2014-01-23: PHP-5.6.0alpha1(rfc freeze) ● 2014-04-11: PHP-5.6.0beta1(feature freeze) ● 2014-06-19: PHP-5.6.0RC1 ● 2014-08-28: PHP-5.6.0
- 4. Some stats about the changes Version Released Commits Authors LOC added LOC deleted 5.3.0 2009-06-30 5339 83 1575768 756904 5.4.0 2012-03-01 18779 135 3701590 2150397 5.5.0 2013-06-20 2842 113 287785 164481 5.6.0 2014-08-28 2013 107 496200 1235336 7.0 N/A 3671 90 531825 1315925
- 5. Release Process https://wiki.php.net/rfc/releaseprocess tl;dr: ● yearly release schedule(timeboxing), 2+1 year support cycle. ● guidelines about what is allowed in a major/minor/micro version. ● resulting smaller, more predictable releases which are easier to upgrade to.
- 6. Changes in 5.6 1. BC breaks 2. New features 3. Deprecated features
- 7. BC breaks ● json_decode() only accepts lowercase for true/false/null to follow the JSON spec. ● Stream wrappers now verify peer certificates and host names by default when using SSL/TLS. ● GMP resources are now objects. ● Mcrypt functions now require valid keys and IVs.
- 8. BC breaks ● unserialize() now validates the serialize format for classes implementing Serializable. ○ class Foo ■ O:3:"Foo":0:{} ○ class Foo implements Serializable ■ C:3:"Foo":4:{r:1;} ○ Can be a problem if you handcrafting the strings (PHPUnit, Doctrine) or storing those somewhere and the class definition changes(Horde).
- 9. BC breaks ● using the @file syntax for curl file uploads are only supported if option CURLOPT_SAFE_UPLOAD is set to false. CURLFile should be used instead.
- 10. BC breaks <?php class C { const ONE = 1; public $array = [ self::ONE => 'foo', 'bar', 'quux', ]; } count((new C)->array); // 2 on <=5.5 but 3 on >=5.6 ?>
- 11. New features The big ones ● Constant scalar expressions ● Variadic functions ● Argument unpacking ● Power operator ● use function and use const ● phpdbg ● SSL/TLS improvements
- 12. Constant scalar expressions <?php const ONE = 1; const TWO = ONE * 2; class C { const THREE = TWO + 1; const ONE_THIRD = ONE / self::THREE; const SENTENCE = 'The value of THREE is '.self::THREE; public function f($a = ONE + self::THREE) { return $a; } } echo (new C)->f()."n"; // 4 echo C::SENTENCE; // The value of THREE is 3 ?>
- 13. Variadic functions <?php function f($req, $opt = null, ...$params) { // $params is an array containing the remaining arguments. printf('$req: %d; $opt: %d; number of params: %d'."n", $req, $opt, count($params)); } f(1); // $req: 1; $opt: 0; number of params: 0 f(1, 2); // $req: 1; $opt: 2; number of params: 0 f(1, 2, 3); // $req: 1; $opt: 2; number of params: 1 f(1, 2, 3, 4); // $req: 1; $opt: 2; number of params: 2 f(1, 2, 3, 4, 5); // $req: 1; $opt: 2; number of params: 3 ?>
- 14. Argument Unpacking <?php function add($a, $b, $c) { return $a + $b + $c; } $operators = [2, 3]; echo add(1, ...$operators); // 6 ?>
- 15. Power operator <?php printf("2 ** 3 == %dn", 2 ** 3); // 2** 3 == 8 printf("2 ** 3 ** 2 == %dn", 2 ** 3 ** 2); // 2 ** 3 ** 2 == 512 $a = 2; $a **= 3; printf("a == %dn", $a); // a == 8 ?>
- 16. use function and use const <?php namespace NameSpace { const FOO = 42; function f() { echo __FUNCTION__."n"; } } namespace { use const NameSpaceFOO; use function NameSpacef; echo FOO."n"; // 42 f(); // NameSpacef } ?>
- 17. phpdbg New SAPI for debugging php scripts ● really handy for debugging cli scripts or debugging without an IDE. ● no out-of-the-box solution for debugging web requests(WIP). ● no IDE integration yet(WIP). ● those familiar with gdb will probably like it.
- 18. phpdbg features ● list source for line/function/method/class ● show info about current files/classes/functions/etc. ● print opcodes for classes/functions/current execution context, etc. ● traverse and sho information about stackframes
- 19. phpdbg features ● show the current backtrace. ● set execution context. ● run the current execution context. ● step through the execution. ● continue the execution until the next breakpoint/watchpoint. ● continue the execution until the next breakpoint/watchpoint after the given line.
- 20. phpdbg features ● continue the execution skipping any breakpoint/watchpoint until the current frame is finished. ● continue the execution skipping any breakpoint/watchpoint to right before we leave the current frame.
- 21. phpdbg features ● set a conditional expression on the target where execution will break if the expression evaluates true. ● set a watchpoint on variable. ● clear breakpoints. ● clean up the execution environment(remove constant/function/class definitions).
- 22. phpdbg features ● set the phpdbg configuration. ● source a phpdbginit script. ● register a phpdbginit function as an alias. ● shell a command. ● evaluate some code. ● quit.
- 23. SSL/TLS improvements ● Stream wrappers now verify peer certificates and host names by default when using SSL/TLS. ● Added support SAN x509 extension matching for verifying host names in encrypted streams. ● New SSL context options for improved stream server security.
- 24. SSL/TLS improvements ● Added support for Server Name Indication. ● Added protocol-specific encryption stream wrappers (tlsv1.0://, tlsv1.1:// and tlsv1.2://). ● Added support for managing SPKAC/SPKI.
- 25. Other features ● __debugInfo() magic method for intercepting var_dump(); ● php://input is reusable ● Large file uploads (>2GB) are now accepted. ● The new GMP objects now support operator overloading. ● hash_equals() for constant time string comparison.
- 26. Other features ● gost-crypto hash algo was added. ● PostgreSQL async support ○ pg_connect($dsn, PGSQL_CONNECT_ASYNC); ○ pg_connect_poll(); ○ pg_socket(); ○ pg_consume_input(); ○ pg_flush(); ● ReflectionClass:: newInstanceWithoutConstructor() can instantiate almost everything.
- 27. Other features ● The default value for default_charset changed to UTF-8, html* iconv* and mbstring* function will use this value when no explicit encoding is set/passed. ● New fetching mode for mysqlnd, controlled via mysqlnd.fetch_data_copy. ○ Will use less memory but do more copying.
- 28. Deprecated features ● Calls from incompatible context will now emit E_DEPRECATED instead of E_STRICT ● always_populate_raw_post_data now have a new value(-1), which completely disables the population of $HTTP_RAW_POST_DATA, setting it anything else will emit an E_DEPRECATED.
- 29. Deprecated features ● The following settings are all deprecated in favor of default_charset: ○ iconv.input_encoding ○ iconv.output_encoding ○ iconv.internal_encoding ○ mbstring.http_input ○ mbstring.http_output ○ mbstring.internal_encoding
- 30. Thanks for your attention! Slides will be here: http://www.slideshare.net/Tyrael If you have any questions: tyrael@php.net @Tyr43l