<?php

  $test = "some ' thing";

  //magic_gpc is ON

  $foo = array("param" => $test);
  parse_str(http_build_query($foo), $output);
  print_r($output);

  /* gives:
Array
(
    [param] => some \\\' thing
)
  */

  $foo = array("param" => addslashes($test));
  parse_str(http_build_query($foo), $output);
  print_r($output);

  /* gives:
Array
(
    [param] => some \\\\\\\' thing
)
*/
?>