Converting a querystring into an associative array

Question

In PHP, I need a function to convert a querystring from an URL, say: http://example.com?key1=value1&key2=value2 into a PHP associative array : array ['key1' => 'value1', 'key2' => 'value2'].

I've come up to this piece of code. It works, but I find it a bit lengthy. (And PHP has built-in functions for everything: I'm surprised I haven't found anything out-of-the-box, something like the reverse of http_build_query.)

Can you suggest a better way to do this?

function getUrlParams($url) {   $querystring = parse_url($url, PHP_URL_QUERY);   $a = explode("&", $querystring);   if (!(count($a) == 1 && $a[0] == "")) {     foreach ($a as $key => $value) {       $b = explode("=", $value);       $a[$b[0]] = $b[1];       unset ($a[$key]);     }     return $a;   } else {     return false;   } } 

Answer 1

You can get just the atributes from a URL using parse_url()

Once you have that you can use parse_str() to convert them to variables, it works with multidimensional arrays too!

$str = "first=value&arr[]=foo+bar&arr[]=baz";  parse_str($str, $output); echo $output['first'];  // value echo $output['arr'][0]; // foo bar echo $output['arr'][1]; // baz