Manager/pages/groups.php

<?php
    if(@$_REQUEST['action'] == 'leave' && @$_REQUEST['group'] != '')
    {
        $statementMembership = $RUNTIME['PDO']->prepare("DELETE FROM os_groups_membership WHERE GroupID = ? AND PrincipalID = ?");
        $statementMembership->execute(array($_REQUEST['group'], $_SESSION['UUID'])); 

        header('Location: index.php?page=groups');
        die();
    }

    include '../app/OpenSim.php';
    $opensim = new OpenSim();

    $HTML->setHTMLTitle("Gruppen");
    $HTML->importSeitenInhalt("pages/HTML/deine-regionen.html");

    $table = '<table class="table"><thead><tr><th scope="col">Name</th><th scope="col">Gründer</th><th scope="col">Aktionen</th></thead><tbody>%%ENTRY%%</tbody></table>';
    
    $statementMembership = $RUNTIME['PDO']->prepare("SELECT GroupID FROM os_groups_membership WHERE PrincipalID = ? ORDER BY GroupID ASC");
    $statementMembership->execute(array($_SESSION['UUID'])); 

    while($rowMembership = $statementMembership->fetch()) 
    {
        $statementGroups = $RUNTIME['PDO']->prepare("SELECT Name,FounderID,GroupID FROM os_groups_groups WHERE GroupID = ? LIMIT 1");
        $statementGroups->execute(array($rowMembership['GroupID']));

        while($rowGroups = $statementGroups->fetch()) 
        {
            $entry = '<tr><td>'.htmlspecialchars($rowGroups['Name']).'</td><td>'.htmlspecialchars($opensim->getUserName($rowGroups['FounderID'])).'</td><td><a href="index.php?page=groups&action=leave&group='.htmlspecialchars($rowGroups['GroupID']).'">VERLASSEN</a></td></tr>';
            $table = str_replace("%%ENTRY%%", $entry."%%ENTRY%%", $table);
        }
    }

    $table = str_replace("%%ENTRY%%", "", $table);
    $HTML->ReplaceSeitenInhalt("%%REGION-LIST%%", $table);

    $HTML->build();
    echo $HTML->ausgabe();
?>