How can PHP caching mechanisms be utilized to improve performance when including external PHP files?

When including external PHP files, performance can be improved by utilizing PHP caching mechanisms such as opcache or APC. These caching mechanisms store precompiled bytecode of PHP scripts, reducing the need to recompile the code on each request, thus improving performance. 

// Enable opcache caching
if (function_exists('opcache_compile_file')) {
    opcache_compile_file('external_file.php');
}

// Include the external PHP file
include 'external_file.php';

Keywords

PHP caching performance optimization include_once opcache APCu

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