how to add query string to url code example

Example 1: javascript add query string to url

function updateQueryStringParameter(uri, key, value) {
  var re = new RegExp("([?&])" + key + "=.*?(&|$)", "i");
  var separator = uri.indexOf('?') !== -1 ? "&" : "?";
  if (uri.match(re)) {
    return uri.replace(re, '$1' + key + "=" + value + '$2');
  }
  else {
    return uri + separator + key + "=" + value;
  }
}

Example 2: 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);
	}
}