Autoloading Classes PHP

autoload_snippet.php

<?php

    //src: https://www.php.net/manual/en/function.spl-autoload-register.php
    // Example to auto-load class files from multiple directories using the SPL_AUTOLOAD_REGISTER method.
    // It auto-loads any file it finds starting with class.<classname>.php (LOWERCASE), eg: class.from.php, class.db.php
    spl_autoload_register(function($class_name) {

        // Define an array of directories in the order of their priority to iterate through.
        $dirs = array(
            'project/', // Project specific classes (+Core Overrides)
            'classes/', // Core classes example
            'tests/',   // Unit test classes, if using PHP-Unit
        );

        // Looping through each directory to load all the class files. It will only require a file once.
        // If it finds the same class in a directory later on, IT WILL IGNORE IT! Because of that require once!
        foreach( $dirs as $dir ) {
            if (file_exists($dir.'class.'.strtolower($class_name).'.php')) {
                require_once($dir.'class.'.strtolower($class_name).'.php');
                return;
            }
        }
    });