Julien Pauli - My blog (Page 2)

Julien Pauli - My blog

PHP's OPCache extension review

Reminder on OPCodes caches PHP is a scripting language, that by default will compile any file you ask it to run, obtain OPCodes [http://blog.jpauli.tech/2015/02/05/zend-vm-executor.html] from compilation, run them, and trash them away immediately. PHP has been designed like that : it "forgets" everything

Getting into the Zend Execution engine (PHP 5)

PHP : an interpreted language PHP is often defined as a "scripting language" or an "interpreted language". What's that ? Well, it is a language that won't turn its instructions (its syntax) directly into native machine language, but into an intermediate form, that obviously won't be directly run by the CPU (as

On PHP function calls (PHP 5)

Introducting the facts This blog post is a technical explanation of a PHP optimization found with Blackfire profiler [https://blackfire.io/] into a PHP script. The related post is located here : http://blog.blackfire.io/owncloud.html Basically, it concludes with : if (strlen($name) > 49) { ... } Beeing about 20% slower than

PHP output buffer in deep Dec 19th, 2014

First words 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

PHP and MySQL communication : mysqlnd

Introduction Appeared with PHP 5.3, mysqlnd is an unknown part of PHP. Yet, this extension is a must-have if your system relies heavily on the MySQL database server. We'll see what mysqlnd is, what it brings to PHP and how to use it. Foresee PHP communicates with MySQL through

PHP memory and Zend Memory Manager (PHP 5)

Introduction 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. Recall on C memory management C has

PHP's Realpath Cache

Introduction Do you know those PHP functions, realpath_cache_get(), realpath_cache_size() ? php.ini setting realpath_cache ? Realpath cache is a really important concept to know about, especially when it comes to play with symbolic links, a situation some meet when they deploy code. This setting is about performance

Reference mismatch in PHP function calls

A recall on references Once again, a coworker just pinged me about a huge memory usage in a Symfony based project. What is bad about Symfony ecosystem, is that people tend to use everyone else's code, because it seems to fit the usage need. This is not bad as-is, but