Les fonctions POSIX ereg eregi ereg_replace eregi_replace split spliti sql_regcase Les fonctions PCRE preg_grep preg_quote preg_match prg_match_all preg_replace preg_replace_callback preg_split Les bibliothèques POSIX & PCRE assurent le support des regex dans PHP.
Les expressions régulières PCRE (Perl) sont jusqu'à 4 à 5 fois plus rapide et plus puissantes que les expressions POSIX.
There are two commonly used tools for profiling PHP Xdebug and XHProf. The later has been written by Facebook and has an associated GUI XHGui.
While XDebug can provide a lot of granular information it does have a significant performance overhead and therefore may not be suitable for production environments. For a good tutorial on using XHProf checkout the link below: http://phpmaster.com/the-need-for-speed-profiling-with-xhprof-and-xhgui/
This blog post is gonna introduce you the dynamic memory management layer PHP relies on : Zend Memory Manager (ZendMM). We'll detail why we need such a layer, what it does, how to customize it, how to interact with it from PHP land.
Everybody is aware of the "output buffering" layer in PHP. This blog post is about how it works, how it's been implemented in PHP source code, and how to interact with it from PHP. This layer is not complex, but often misunderstood, or at least, not fully mastered by PHP developers. Let's try to fix that together. We'll talk about PHP >=5.4, should you know that many things have changed starting 5.4 about the OB layer, in fact, it has been completely rewritten and broke compatibility in some ways with PHP 5.3 (documented).
During the last week my team dedicated almost all its time to performance optimization. During the experience we measures metric with a series of tools fro
The Accelerated Mobile Pages (AMP) Project is an open source initiative that makes it easy for publishers to create mobile-friendly content once and have it load instantly everywhere. – Accelerated Mobile Pages Project
Hang on. You were going to stop reading here, to go browse your codebase and replace strlen() calls by isset() calls. So that's why I stopped you. If you read carefully the original blog post, this performance result boost of about 20% is obtained because strlen() was used in a loop of about 60 to 80K iterations (60,000 to 80,000).
Surviving The Deep End: A free online book about Zend Framework for the PHP programming language to guide you through the task of developing a real application with the Zend Framework
Hopefully you've had some time to digest the first three parts of my HHVM Extension Writing series, and you're ready to embark into the world of Resources. Not quite as exciting as objects, they're certainly less commonly used in new extensions since Objects are so much more versatile, but there were an integral part of PHP's history prior to PHP5, and are still in heavy use by such features as streams, curl, and most database connectors.
Whether or not foreach copies the array and how much of it depends on three things: Whether the iterated array is referenced, how high its refcount is and whether the iteration is done by reference.
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