/**
* Add param(s) at the end of an URL, using either "?" or "&" depending on existing url
*
* @param string existing url
* @param string|array Params to add (string as-is) or array, which gets urlencoded.
* @param string delimiter to use for more params
*/
function url_add_param($url, $param, $glue = '&')
{
if (empty($param)) {
return $url;
}
if (($anchor_pos = strpos($url, '#')) !== false) {
// There's an "#anchor" in the URL
$anchor = substr($url, $anchor_pos);
$url = substr($url, 0, $anchor_pos);
} else {
// URL without "#anchor"
$anchor = '';
}
// Handle array use case
if (is_array($param)) {
// list of key => value pairs
$param_list = array();
foreach ($param as $k => $v) {
$param_list[] = get_param_urlencoded($k, $v, $glue);
}
$param = implode($glue, $param_list);
}
if (strpos($url, '?') !== false) {
// There are already params in the URL
$r = $url;
if (substr($url, -1) != '?' && substr($param, 0, 1) != '#') {
// the "?" is not the last char AND "#" is not first char of param
$r .= $glue;
}
return $r . $param . $anchor;
}
// These are the first params
return $url . '?' . $param . $anchor;
}
/**
* Get URL param, urlencoded.
* This handles arrays, recursively.
* @return string
*/
function get_param_urlencoded($var, $value, $glue = '&')
{
if (is_array($value)) {
// there is a special formatting in case of arrays
$r = array();
$keep_keys = array_diff(array_keys($value), array_keys(array_values($value)));
foreach ($value as $key => $value) {
$r[] = get_param_urlencoded($var . '[' . ($keep_keys ? $key : '') . ']', $value, $glue);
}
return implode($glue, $r);
} else {
// not an array : normal formatting
return rawurlencode($var) . '=' . rawurlencode($value);
}
}
