Description:
------------
Hello,
   I've found a perplexing bug with sorting flags.  When you create a function to create (for example) an dynamic array_multisort() and one of the arguements which is passed is a SORT_ASC (or any other flag) which is used to create the array_multisort() it MUST be passed without quotes and not as a string.

In the example below you will see that if you gettype() of the $arg the SORT_DESC returns an integer not a string when passed without quotes and a string with.  

If the SORT flag is passed as a string the array_multisort acts as if it were null.

This stops me from setting the SORT flag via if statement. 

I have written a work around but this problem should be addressed because if you settype() a string it becomes "0".

The function call is:
 $ new_array = array_column_sort($someArray,'column',SORT_DESC)

The function does not work if you use:
$sortFlag = "SORT_ASC"; 
 $ new_array = array_column_sort($someArray,'column',$sortFlag )



Reproduce code:
---------------
function array_column_sort(){ 
  $args = func_get_args();
  $array = array_shift($args);
  // make a temporary copy of array for which will fix the 
  // keys to be strings, so that array_multisort() doesn't
  // destroy them
  $array_mod = array();
  foreach ($array as $key => $value)
    $array_mod['_' . $key] = $value;
  
  $i = 0;
  $multi_sort_line = "return array_multisort( ";
  foreach ($args as $arg)  {
      $i++;
      if ( is_string($arg) ){
          foreach ($array_mod as $row_key => $row){
              $sort_array[$i][] = $row[$arg];
          }
      }else{
          $sort_array[$i] = $arg;
      }
      $multi_sort_line .= "\$sort_array[" . $i . "], ";
  }
  $multi_sort_line .= "\$array_mod );"; 
  eval($multi_sort_line);
  // now copy $array_mod back into $array, stripping off the "_"
  // that we added earlier.
  $array = array();
  foreach ($array_mod as $key => $value)
    $array[ substr($key, 1) ] = $value;

  return $array;
}

Expected result:
----------------
The array should be sorted by column and SORT flag.

Actual result:
--------------
The array_multisort only excepts the SORT flag without quotes and not as a string.