如何使用php

Question

我有一个由javascript.am动态添加texfeild的表单，使用数组提取php文件中的textfeild值。一切似乎都很好。但是我很难将数据保存到数据库中。请帮忙。下面是我的代码。

在此处形成值

    <form method="POST" id="theForm" action="invpdf.php"><div id="fields">
    <input type="text" name="fields[barcode][]"/>
    <input type="text" name="fields[description][]"/>
    <input type="text" id="unity"name="fields[unitprice][]" />
    <input type="text" id="qty"name="fields[qty][]"/>
     <input type="text" id="total"name="fields[total][]"/>

    <br/>
</div>
 <input type="button" id="addField" value="Add Field"/></form>

javascript添加textfeilds

    <script>
      $(document).ready(function() {

    $('#addField').click(function() {
        $('#fields').append(
            $('<input type="text" name="fields[barcode][]"/>'),
            $('<input type="text" name="fields[description][]"/>'),
              $('<input type="text" name="fields[unitprice][]"/>'),
            $('<input type="text" name="fields[qty][]"/>'),
              $('<input type="text" name="fields[total][]"/>'),

            $('<br/>')
        );
    })
    });
</script>

我的php处理如下面的代码

     $numemma = count($_POST['fields']['barcode']);
for ($i = 0; $i < $numemma; $i++) {
$field = array(
    'barcode' => $_POST['fields']['barcode'][$i],
    'description' => $_POST['fields']['description'][$i],
    'unitprice' => $_POST['fields']['unitprice'][$i],
     'qty' => $_POST['fields']['qty'][$i],
    'total' => $_POST['fields']['total'][$i]
);

$feeilds = '`'.implode('`,`', $field).'`';
$data = '\''.implode('\',\'',$field).'\'';
mysqli_query($conn,"INSERT INTO `sales`($feeilds)VALUES($data)");
    }