php - 数组 : Notice: Undefined offset: 0 的问题

Question

我得到了这个 php 代码，我正在尝试将 HTML 表转换为数组，然后进行 mysqli 查询，但我不知道如何操作

我有这个变量 $aDataTableDetailHTML[][]，其中第一个 [] 中有 tr 和 td 的数量表，在第二个 [] 中有它们各自的 tr

的 td

<?php
$htmlContent = file_get_contents("FrmClientes.php");

    $DOM = new DOMDocument();
    @$DOM->loadHTML($htmlContent);

    $Header = $DOM->getElementsByTagName('th');
    $Detail = $DOM->getElementsByTagName('td');

//#Get header name of the table
    foreach($Header as $NodeHeader) 
    {
            $aDataTableHeaderHTML[] = trim($NodeHeader->textContent);
    }
    //print_r($aDataTableHeaderHTML); die();

    //#Get row data/detail table without header name as key
    $i = 0;
    $j = 0;
    foreach($Detail as $sNodeDetail) 
    {
            $aDataTableDetailHTML[$j][] = trim($sNodeDetail->textContent);
            $i = $i + 1;
            $j = $i % count($aDataTableHeaderHTML) == 0 ? $j + 1 : $j;
    }
    //print_r($aDataTableDetailHTML); die();
//print_r($aDataTableDetailHTML[0][3]); die();

    //#Get row data/detail table with header name as key and outer array index as row number
    for($i = 0; $i < count($aDataTableDetailHTML); $i++)
    {
            for($j = 0; $j < count($aDataTableHeaderHTML); $j++)
            {
                    $aTempData[$i][$aDataTableHeaderHTML[$j]] = $aDataTableDetailHTML[$i][$j];
            }
    }
    $aDataTableDetailHTML = $aTempData; unset($aTempData);
    //print_r($aDataTableDetailHTML); die();

    //print_r($aDataTableDetailHTML[0][0]); die();

    $CON = mysqli_connect("localhost","root","","BDfactura") or die ("error");

    $cadena = "INSERT INTO ItemXVenta (NroVenta, IdArticulo, Cantidad, ValorVenta) VALUES ";

    for($k=0; $k < count($aDataTableDetailHTML); $k++)
    {
        $cadena.="('".null."', '".$aDataTableDetailHTML[$k][0]."', '".$aDataTableDetailHTML[$k][3]."', '".$aDataTableDetailHTML[$k][2]."'),";
    }

    echo json_encode(array('cadena' => $cadena));


?>

这是HTML代码

<div class="table-responsive" id="adicionados">          
<table class="table" id="tabla">
<thead>
  <tr>
    <th>ID Articulo</th>
    <th>Descripcion</th>
    <th>Valor Venta</th>
    <th>Cantidad</th>
    <th>Subtotal</th>
  </tr>
</thead>
<tbody>
  <tr>
    <td id="Sid">ID</td>
    <td id="Sdescripcion">Descripcion</td>
    <td id="Svlrventa">VLR</td>
    <td id="Scantidad">CANTIDAD</td>
    <td id="Ssubtotal">TOTAL</td>
  </tr>
  <tr>
    <td id="Sid">dw</td>
    <td id="Sdescripcion">ads</td>
    <td id="Svlrventa">ads</td>
    <td id="Scantidad">da</td>
    <td id="Ssubtotal">ad</td>
  </tr>

</tbody>
</table>
</div>

这是输出

Notice: Undefined offset: 0 in /opt/lampp/htdocs/ProyectoClasesPHP 11-04-2018/Guardar Factura.php on line 48

Notice: Undefined offset: 3 in /opt/lampp/htdocs/ProyectoClasesPHP 11-04-2018/Guardar Factura.php on line 48

Notice: Undefined offset: 2 in /opt/lampp/htdocs/ProyectoClasesPHP 11-04-2018/Guardar Factura.php on line 48

Notice: Undefined offset: 0 in /opt/lampp/htdocs/ProyectoClasesPHP 11-04-2018/Guardar Factura.php on line 48

Notice: Undefined offset: 3 in /opt/lampp/htdocs/ProyectoClasesPHP 11-04-2018/Guardar Factura.php on line 48

Notice: Undefined offset: 2 in /opt/lampp/htdocs/ProyectoClasesPHP 11-04-2018/Guardar Factura.php on line 48

{"cadena":"INSERT INTO ItemXVenta (NroVenta, IdArticulo, Cantidad, ValorVenta) VALUES ('', '', '', ''),('', '', '', ''),"}

Answer 1

检查错误行中的 Isset。 isset() 函数用于检查变量是否已设置如果测试变量包含 NULL 值，isset() 函数返回 false。

   for($i = 0; $i < count($aDataTableDetailHTML); $i++)
    {
            for($j = 0; $j < count($aDataTableHeaderHTML); $j++)
            {
                if(isset($aDataTableDetailHTML[$i][$j])){
                    $aTempData[$i][$aDataTableHeaderHTML[$j]] = $aDataTableDetailHTML[$i][$j];
                }
            }
    }