从url到数组的PHP $ _GET值（自定义函数）

Question

Lets say I have an:

$url = "bla.php?test1=a&test2=b&test1=c&test2=d&test1=e&test2=f&test1=g&test2=h&test1=i&test2=j";

then I wish to run the custom function getToArray("test1") which would create an array with values ["a", "c", "e", "g", "i"]

I am trying to figure out how, but so far no luck.

Please note that in case of using getToArray("test2"), the last value from $_GET will be "j" which is end of the string...

Answer 1

This should do what you want. Basically it keeps exploding the url, first by ? to get the query string, then that by & to get the individual key/value pairs, and then each of those pairs by = to get the key and value. If the key matches the search string, it is added to the output array.

function getToArray($url, $key) {
    $values = array();
    list (, $query_string) = explode('?', $url, 2);
    foreach (explode('&', $query_string) as $param) {
        list($k, $v) = explode('=', $param, 2);
        if ($k == $key) $values[] = $v;
    }
    return $values;
}
print_r(getToArray($url, 'test1'));
print_r(getToArray($url, 'test2'));

Output:

Array ( [0] => a [1] => c [2] => e [3] => g [4] => i ) 
Array ( [0] => b [1] => d [2] => f [3] => h [4] => j )

Demo on 3v4l.org