PHP foreach 函数在另一个 foreach 函数中

<?php
        echo'<table border="1">';
        foreach (RetrieveSpecificSubMenu() as $value){
            echo "<tr>";
            echo'<td colspan="2">';
            echo "Sub Menu Details";
            echo'</td>';
            echo "</tr>";
            echo "<tr>";
            echo'<td>';
            echo "Sub Menu ID:";
            echo'</td>';
            echo'<td>';
            echo "<input readonly type='text' name='submenuid' value=" .$value['menuid']. " class='box required'/>";
            echo'</td>';
            echo "</tr>";
            echo "<tr>";
            echo'<td>';
            echo "Sub Menu Name:";
            echo'</td>';
            echo'<td>';
            echo "<input type='text' name='submenuname' value='" .htmlspecialchars($value['menuname'], ENT_QUOTES). "' class='box required'/>";
            echo'</td>';
            echo "</tr>";
            echo "<tr>";
            echo'<td>';
            echo "Parent Name:";
            echo'</td>';
            echo'<td>';
            echo "<input type='text' name='parentid' value='" .htmlspecialchars($value['parentid'], ENT_QUOTES). "' class='box required'/>";
            echo'<select name="submenuurl">';
                    echo"<option value='" .htmlspecialchars($value['parentid'], ENT_QUOTES). "'>".$value['menuurl']."</option>";
                    foreach (RetrieveAllMenuinDatabase() as $value){
                        echo "<option value='".$value['menuname']."'>".$value['menuname']."</option>";
                    }   
        echo'</select>';
            echo'</td>';
            echo "</tr>";
            echo "<tr>";
            echo'<td>';
            echo "Sub Menu Description:";
            echo'</td>';
            echo'<td>';
            echo "<input type='text' name='submenudescription' value='" .htmlspecialchars($value['menudescription'], ENT_QUOTES). "' class='box required'/>";
            echo'</td>';
            echo "</tr>";
            echo "<tr>";
            echo'<td>';
            echo "Sub Menu(Second Level):";
            echo'</td>';
            echo'<td>';
                if($value['menuflag']==="1"){
                    echo "<input id='remember' class='submenumanagementmenuflag' type='checkbox' name='submenuflag' value='" .$value['menuflag']. "' class='box required' checked='checked'/>"."Yes";
                }else{
                    echo "<input id='remember' class='submenumanagementmenuflag' type='checkbox' name='submenuflag' value='" .$value['menuflag']. "' class='box required' check''/>"."Yes";
                }
            echo'</td>';
            echo "</tr>";
            echo "<tr>";
            echo'<td>';
            echo "Display Order:";
            echo'</td>';
            echo'<td>';
            echo "<input  type='text' name='submenudisplayorder' value=" .$value['menudisplayorder']. " class='box required'/>";
            echo'</td>';
            echo "</tr>";
            echo "<tr class='submenumanagementurl'>";
            echo'<td>';
            echo "Menu Url:";
            echo'</td>';
            echo'<td>';
                echo'<select name="submenuurl">';
                    echo"<option value=" .$value['menuurl']. ">".$value['menuurl']."</option>";
                    foreach (RetrieveAllPages() as $value){
                        echo "<option value='".$value['Filename']."'>".$value['Filename']."</option>";
                    }   
        echo'</select>';
            echo'</td>';
            echo "</tr>";
        }   
        echo'</table>';
    ?>

这是工作代码，它从数据库中获取数据并向他们显示 sa echo 我有一个想法，将另一个函数放入其中，即

foreach (RetrieveAllMenuinDatabase() as $value){ echo "<option value='".$value['menuname']."'>".$value['menuname']."</option>"; }

将其放入代码后，找不到其余值，为什么会发生这种情况，我只想知道为什么，所以我可以找到如何解决它的想法。

仅供参考，内部foreach的输出是问题在于foreach后面的值都消失了，它得到错误，它说它是未定义的