How to implement my own php code in files

If you mean the parameter string from the client request, you get that with $_REQUEST or $_GET or $_POST as appropriate. If you mean the snippet parameter string, each will be set as a variable with the key as the name, within the scope of the snippet. Your var names would simply be $key_1, $key_2, ...

[!snippet?&id=`DisplayName`&param=`%26$name%3DVorspiel`!]

$x = "";
foreach ($_REQUEST as $key=>$value)
$x .= $key . ' ' . $value . '<br>';
return $id . " : " . $x;

function formatURLParameterToArray($paramListe)
{if (!isset($paramListe) || strlen($paramListe)<1)
        return null;

    $paramListe = urldecode($paramListe);
    $paramArray = array();

    # erstes & entfernen
    if (strpos($paramListe,'&')==0)
        $paramListe = substr($paramListe,1);

    $a = explode('&', $paramListe);
    $i = 0;
    while ($i < count($a))
    {   $b = split('=', $a[$i]);
        $paramArray[htmlspecialchars(urldecode($b[0]))] =
            htmlspecialchars(urldecode($b[1]));
        $i++;
    }
return $paramArray;
}

$_REQUEST is a good idea, but it returns strange results ...

return $id;

Hi persepolis,

The problem here is that you have mixed and matched $_REQUEST with the snippet parameters being passed into the snippet. They are two very separate sets of values.

$_REQUEST variables (including $_GET or $_POST) are called client request variables. $_GET variables are passed via the URL (eg. mysite.com/index.html?myGetVar1=1&myGetVar2=2) and $_POST variables are created when a form is posted back from the client.
Snippet parameters are automatically created as string variables by the MODx document parser, in your example:

return $id;

would return the desired value of ’displayName’.

Hope that helps (rather than confusing further),
Garry