Problems with arrays: Notice: Undefined offset: 0 - php

Question

i got this php code, i'm trying to convert a HTML table to a array and then make a mysqli query, but i don't know how
I have this variable $aDataTableDetailHTML[][] where in the first [] there is the number of tr with td in the table, and in the second [] there are the td of their respective tr
<?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));
?>
Here is the HTML code
<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>
Here is the OUTPUT
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

Check Isset in your error line.
The isset () function is used to check whether a variable is set or not The isset() function return false if testing variable contains a NULL value.
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];
}
}
}

Answer 2

I solved the problem, the fixed code looks like this:
<?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[$k]["ID Articulo"]."', '".$aDataTableDetailHTML[$k]["Cantidad"]."', '".$aDataTableDetailHTML[$k]["Valor Venta"]."'),";
}
echo json_encode(array('cadena' => $cadena));
//var_dump($aDataTableDetailHTML);
?>