Replace Array Keys in PHP

If you want to replace the keys in an array there is no native php function that does this currently. So I wrote one. It takes the keys from the first array and replaces it with a new key. See code snippet below.

/**
 * Changes the keys of an array by matching the keys of both arrays and changes to the value
 * @return array
 *
 * Example Usage:
 *   $ary1 = array('myBadKey' => 1, 2, 'foo' => bar);
 *   $ary2 = array('myBadKey' => 'myGoodKey', 0 => 'NonNumericKey');
 *   print_r(array_key_merge($ary1, $ary2));
 */

function array_key_merge($array1, $array2)
{
   foreach($array2 as $key => $value)
   {
      if(array_key_exists($key, $array1))
      {
         $array1[$array2[$key]] = $array1[$key];
         unset($array1[$key]);
      }
   }

   return $array1;
}