我试图在wordpress管理中创建一个动态表单，在这里我可以添加一行，并且仍然能够将变量作为post meta处理到数据库中。我做了很多研究，尝试了几种方法，但似乎都没能奏效。我这里有一个代码示例来展示我是如何处理信息的，我只需要弄清楚如何循环浏览动态内容，然后根据需要适当地更新或删除它。

    <?php 

    // Set Up Meta Boxes

    function add_invoice_meta_boxes() {
        add_meta_box(\'invoice_meta_box\', \'Invoice Summary\', \'setup_invoice_meta_box\', \'invoice\', \'normal\', \'high\');
    }
    add_action(\'add_meta_boxes\', \'add_invoice_meta_boxes\');

    // Invoice Meta Box
    function setup_invoice_meta_box($post) {
        echo \'<input type="hidden" name="invoice_meta_box_nonce" value="\'. wp_create_nonce(\'invoice_meta_box\'). \'" />\';

    ?>

    <script language="javascript">function addRow(tableID){var table=document.getElementById(tableID);var rowCount=table.rows.length;var row=table.insertRow(rowCount);var colCount=table.rows[0].cells.length;for(var i=0;i<colCount;i++){var newcell=row.insertCell(i);newcell.innerHTML=table.rows[0].cells[i].innerHTML;switch(newcell.childNodes[0].type){case"text":newcell.childNodes[0].value="";break;case"checkbox":newcell.childNodes[0].checked=false;break;case"select-one":newcell.childNodes[0].selectedIndex=0;break;}}}
    function deleteRow(tableID){try{var table=document.getElementById(tableID);var rowCount=table.rows.length;for(var i=0;i<rowCount;i++){var row=table.rows[i];var chkbox=row.cells[0].childNodes[0];if(null!=chkbox&&true==chkbox.checked){if(rowCount<=1){alert("Cannot delete all the rows.");break;}
    table.deleteRow(i);rowCount--;i--;}}}catch(e){alert(e);}}</script>

    <?php } ?>

    <div class="wrap">
    <table border="0" cellpadding="0" cellspacing="0" width="100%">
    </tr>
    <tr>
    <td>
    <input type="button" value="Add Row" onclick="addRow(\'dataTable\')">
    <input type="button" value="Delete Row" onclick="deleteRow(\'dataTable\')">
    </td>
    </tr>
    <tr>
    <td>
        <table>
        <tr>
        <th width="20px">&nbsp;</th>
        <th width="202px">Product</th>
        <th width="252px">Description</th>
        <th width="52px">QTY</th>
        <th width="102px">Price</th>
        <th width="102px">Tax</th>
        <th width="202px">Amount</th>
        </tr>
        </table>
    </td>
    </tr>
    <tr>
    <td>
        <table id="dataTable">
        <tr>
        <td><input type="checkbox" class="gho-chk" name="chk"></td>
        <td><input type="text" class="gho-description" name="product[]" value="<?php echo get_post_meta($post_>ID, \'product[]\', true); ?>" /></td>
        <td><input type="text" class="gho-description" name="description[]" value="<?php echo get_post_meta($post_>ID, \'description[]\', true); ?>" /></td>
        <td><input type="text" class="gho-qty" name="qty[]" value="<?php echo get_post_meta($post_>ID, \'qty[]\', true); ?>" /></td>
        <td><input type="text" class="gho-price" name="price[]" value="<?php echo get_post_meta($post_>ID, \'price[]\', true); ?>" /></td>
        <td><input type="text" class="gho-tax" name="tax[]" value="<?php echo get_post_meta($post_>ID, \'tax[]\', true); ?>" /></td>
        <td><input type="text" class="gho-amount" name="amount[]" value="<?php echo get_post_meta($post_>ID, \'amount[]\', true); ?>" /></td>
        </tr>
        </table>
    </td>
    </tr>
    </table>

    </div>

    <?php 
    function save_invoice_meta_box($post_id) {
        // check nonce
        if (!isset($_POST[\'invoice_meta_box_nonce\']) || !wp_verify_nonce($_POST[\'invoice_meta_box_nonce\'], \'invoice_meta_box\')) {
            return $post_id;
        }

        // check capabilities
        if (\'invoice\' == $_POST[\'post_type\']) {
            if (!current_user_can(\'edit_post\', $post_id)) {
                return $post_id;
            }
        } elseif (!current_user_can(\'edit_page\', $post_id)) {
            return $post_id;
        }

        // exit on autosave
        if (defined(\'DOING_AUTOSAVE\') && DOING_AUTOSAVE) {
            return $post_id;
        }

        if(isset($_POST[\'product\'])) {
            update_post_meta($post_id, \'product\', $_POST[\'product\']);
        } else {
            delete_post_meta($post_id, \'product\');
        }

    }

    add_action(\'save_post\', \'save_invoice_meta_box\');

    ?>