Fehler mit Leeren einer Tabelle.

echo "<br><form action='admin.php?id=17' method='post' name='dell_all_logs'>";
echo "<input type='submit' value='Leeren'>";
echo "</form>";

echo '<br><form action="admin.php?id=17" method="post" name="dell_all_logs">';
echo '<input type="hidden" name="del_all_logs" value="true">';
echo '<input type="submit" value="Leeren">';
echo '</form>';

echo '<br><form action="admin.php?id=17" method="post" name="dell_all_logs">';
echo '<input type="hidden" name="dell_all_logs" value="true">';
echo '<input type="submit" value="Leeren">';
echo '</form>';