POST in array (Opgelost)

$aKeys = array();
foreach($_POST as $iKey => $sValue)
{
    if($sValue == 'on')
    {
        $aKeys[] = $iKey;
    }
}

$aKeys = array();
foreach($_POST as $iKey => $sValue)
{
    if($sValue == 'on')
    {
        $aKeys[] = $iKey;
    }
}