Wordpress Plugin Autloader

bootstrap.php

<?php 

class vendorAutoloader
{
	const BASENAME = 'vendor';
	const BASESRC = 'src';

	/**
	 * Static loader method
	 * @param string $class
	 */
	public static function load( $class ) {
		if ( self::BASENAME == substr( $class, 0, 6 ) ) {
			$classPath = str_replace( '\\', DIRECTORY_SEPARATOR, $class );
			require_once PT_PATH . self::BASESRC . DIRECTORY_SEPARATOR . $classPath . '.php';
		}
	}
}

/**
 * The autoload-stack could be inactive so the function will return false
 */
if ( in_array( '__autoload', (array) spl_autoload_functions() ) ) {
	spl_autoload_register( '__autoload' );
}
spl_autoload_register( [ 'vendorAutoloader', 'load' ] );