Wstęp

Windows Cache Extension for PHP is a PHP accelerator that is used to increase the speed of PHP applications running on Windows and Windows Server. Once the Windows Cache Extension for PHP is enabled and loaded by the PHP engine, PHP applications can take advantage of the functionality without any code modifications.

The Windows Cache Extension includes 3 different types of caches. The following describes the purpose of each cache type and the benefits it provides.

• PHP Opcode Cache - PHP is a script processing engine, which reads an input stream of data that contains text and/or PHP instructions and produces another stream of data, most commonly in the HTML format. This means that on a web server the PHP engine reads, parses, compiles and executes a PHP script each time that it is requested by a Web client. The reading, parsing and compilation operations put additional load on the web server's CPU and file system and thus affect the overall performance of a PHP web application. The PHP bytecode (opcode) cache is used to store the compiled script bytecode in shared memory so that it can be re-used by PHP engine for subsequent executions of the same script.

• File Cache - Even with the PHP bytecode cache enabled, the PHP engine has to accesses the script files on a file system. When PHP scripts are stored on a remote UNC file share, the file operations introduce a significant performance overhead. The Windows Cache Extension for PHP includes a file cache that is used to store the content of the PHP script files in shared memory, which reduces the amount of file system operations performed by PHP engine.

• Relative File Path Cache - PHP scripts very often include or operate with files by using relative file paths. Every relative file path has to be converted to an absolute file path by the PHP engine. When a PHP application uses many PHP files and accesses them by relative paths, the operation of resolving relative paths to absolute paths may negatively impact the application's performance. The Windows Cache Extension for PHP provides a Relative File Path cache, which is used to store the mappings between relative and absolute file paths, thereby reducing the number of relative path resolutions that the PHP engine has to perform.