spl_autoload_register include different folders code example

Example: spl_autoload_register

spl_autoload_register( 'autoload' );


  /**
   * autoload
   *
   * @param  string $class
   * @param  string $dir
   * @return bool
   */
  function autoload( $class, $dir = null ) {

    if ( is_null( $dir ) )
      $dir = '/path/to/project';

    foreach ( scandir( $dir ) as $file ) {

      // directory?
      if ( is_dir( $dir.$file ) && substr( $file, 0, 1 ) !== '.' )
        autoload( $class, $dir.$file.'/' );

      // php file?
      if ( substr( $file, 0, 2 ) !== '._' && preg_match( "/.php$/i" , $file ) ) {

        // filename matches class?
        if ( str_replace( '.php', '', $file ) == $class || str_replace( '.class.php', '', $file ) == $class ) {

            include $dir . $file;
        }
      }
    }
  }