WordPress Add Query String To Url

PHPfunction shapeSpace_add_var($url, $key, $value) {

 $url = preg_replace('/(.*)(?|&)'. $key .'=[^&]+?(&)(.*)/i', '$1$2$4', $url .'&');
 $url = substr($url, 0, -1);

 if (strpos($url, '?') === false) {
  return ($url .'?'. $key .'='. $value);
 } else {
  return ($url .'&'. $key .'='. $value);
 }
}

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