autoload php multiple spl_autoload_register

<?php
/**
 *
 * @param string $className Class or Interface name automatically
 *              passed to this function by the PHP Interpreter
 */
function autoLoader($className){
    //Directories added here must be relative to the script going to use this file
    $directories = array(
      '',
      'classes/'
    );
 
    //Add your file naming formats here
    $fileNameFormats = array(
      '%s.php',
      '%s.class.php',
      'class.%s.php',
      '%s.inc.php'
    );
 
    // this is to take care of the PEAR style of naming classes
    $path = str_ireplace('_', '/', $className);
    if(@include_once $path.'.php'){
        return;
    }
     
    foreach($directories as $directory){
        foreach($fileNameFormats as $fileNameFormat){
            $path = $directory.sprintf($fileNameFormat, $className);
            if(file_exists($path)){
                include_once $path;
                return;
            }
        }
    }
}
 
spl_autoload_register('autoLoader');
?>