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$name = 'AppPromoZhongQiu2014ActiveStatusSelector';

echo cc_format($name);

function cc_format($name){

  $temp_array = array();

  for($i=0;$i<strlen($name);$i++){

    $ascii_code = ord($name[$i]);

    if($ascii_code >= 65 && $ascii_code <= 90){

      if($i == 0){

         $temp_array[] = chr($ascii_code + 32);

      }else{

        $temp_array[] = '_'.chr($ascii_code + 32);

      }

    }else{

      $temp_array[] = $name[$i];

    }

  }

  return implode('',$temp_array);

}