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The ionCube PHP Accelerator: Home

Description

Every time a PHP script is accessed, the PHP engine must open the script file and read, parse, and compile the file contents into a compiled form. Only then can the compiled code be executed. With scripts often including other scripts, this work can become a significant part of the overall time to deliver a page. It can also impact I/O performance, and require much dynamic memory allocation that in itself can be time consuming.

The reality, however, is that most PHP scripts never change from one access to the next; indeed they may never change for weeks, months, or even years. The Accelerator works to eliminate the penalty of processing scripts that never change, and by caching the compiled scripts in shared memory, delivers significant performance gains as a result. Note that this is very different to caching script output. PHPA doesn't do this, scripts remain fully dynamic, and if they do change then PHPA caches a new version - they just run faster!

Once script execution has completed, compiled versions of any new or modified scripts are immediately cached on disk for later reuse. This guarantees good acceleration, but scripts are then cached in shared memory, and offering the maximum performance gains.

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