gistfile1.php

if (!function_exists('get_called_class')) {
    function get_called_class() {
        $bt = debug_backtrace();
        $lines = file($bt[1]['file']);
        preg_match(
          '/([a-zA-Z0-9\_]+)::'.$bt[1]['function'].'/',
          $lines[$bt[1]['line']-1],
          $matches
        );
        return $matches[1];
    }
}