Exactly this is what came to my mind in the meantime!
Just for the records, if somebody ever tries to solve the same problem:
$sVarName = "THE_NAME";
$iVarStart = index($URL, $sVarName);
$sVarContent = substr($URL , $iVarStart + length($sVarName) +1);
$iNextVarStart = index($sVarContent, "&");
if ($iNextVarStart > -1) {
$sVarContent = substr($sVarContent,
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