Multiple HTTP GET parameters with the same identifier

Question

Let's say I am getting requests such as:

http://www.example.com/index.php?id=123&version=3&id=234&version=4

Is it possible to extract these in a simple way inside my php code? I realize I could get the entire querystring with javascript using window.location.href and handle it manually but I'm looking for something more elegant. The requests can contain any number of version/id pairs but I can assume that the query is well-formed and have no obligation to handle invalid strings.

Answer 1

According to this comment from the PHP manual, PHP's query string parser will drop duplicate params... so I don't think that PHP is a good fit for what you want to do (except in that it has the same capacity as javascript to get the raw query string, with which you can do whatever you want)

Answer 2

If you can change the field name to include [], then PHP will create an array containing all of the matching values:

http://www.example.com/index.php?id[]=123&version[]=3&id[]=234&version[]=4

If you don't have the ability to change the field names, then as you say, you'll have to parse the querystring yourself.

Answer 3

Assuming you have some control over the request, suffix the name with [] and PHP will generate arrays instead of dropping all but one.

http://www.example.com/index.php?id[]=123&version[]=3&id[]=234&version[]=4

Since they are pairs you'll probably want to fix the order they appear in using indexes.

http://www.example.com/index.php?id[0]=123&version[0]=3&id[1]=234&version[1]=4

Answer 4

Just extract the keys and values of $_GET, use the function as:

print_array('$_GET...',$_GET);

... and the function code will be:

function print_array($title, $arr) {
    echo '<table width="100%" style="padding:10;">';
    echo '<tr><td width="30%" style="text-align:right; background-color:bisque;">key of </td><td style="background-color:bisque;">'.$title.'</td></tr>';
    foreach($arr as $key => $value) {
        echo '<tr>';
            echo '<td style="text-align:right; color:grey;">';
                echo $key;
            echo '</td>';
            echo '<td>';
                echo $value;
            echo '</td>';
        echo '</tr>';
    }
    echo '</table>';
}

Answer 5

Not as rounded or reliable as methods mentioned above but I use this to remove the need to [] in urls without worrying about rewriting.

$aQuery = explode("&", $_SERVER['QUERY_STRING']);
$aQueryOutput = array();
foreach ($aQuery as $param) {
    if(!empty($param)){
        $aTemp = explode('=', $param, 2);
        if(isset($aTemp[1]) && $aTemp[1] !== ""){
            list($name, $value) = explode('=', $param, 2);
            $aQueryOutput[ strtolower(urldecode($name)) ][] = urldecode(preg_replace('/[^a-z 0-9\'+-]/i', "", $value));
        }
    }
}