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Adding and Removing Query Vars

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  1. function add_querystring_var($url, $key, $value) {
  2.  $url = preg_replace('/(.*)(\?|&)' . $key . '=[^&]+?(&)(.*)/i', '$1$2$4', $url . '&');
  3.  $url = substr($url, 0, -1);
  4.  if (strpos($url, '?') === false) {
  5.  return ($url . '?' . $key . '=' . $value);
  6.  } else {
  7.  return ($url . '&' . $key . '=' . $value);
  8.  }
  9. }
  10.  
  11. function remove_querystring_var($url, $key) {
  12.  $url = preg_replace('/(.*)(\?|&)' . $key . '=[^&]+?(&)(.*)/i', '$1$2$4', $url . '&');
  13.  $url = substr($url, 0, -1);
  14.  return ($url);
  15. }

URL: http://www.addedbytes.com/php/querystring-functions/

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