How can we pass table to an html variable in php code? Magento2 TCPDF

Question

I am using TCPDF Library to get PDF Downloadable. I have to pass retrieved data through loops to single vaiable as:

$tcpdf->writeHTML($html, true, false, true, false, '');

I have to pass these values to $html varibable:

$html = '<h1>'.'Order Number:    '.$OrderId.'<br />Customer Name:    '.$customerName.'<br />Item Name:    '.$itemName.'</h1>';

but I have multiple records and have to pass this information many time through loops.

This is the table I want to pass from template to $html variable(PDF object):

<h2 align ="center" bgcolor ="#75777a">Order Pick List</h2>
<table>
<tr>
<th>Col 1</th>
<th>Col 2</th>
<th>Col 3</th>
</tr>
<?php $Orders= $block->getOrders();
    foreach ($Orders as $order) {
        $Colone = $order->getID();
        $Coltwo = $order->getName();
        $items = $order->getitems();?>

        <tr>
            <td><?php echo $Colone; ?></td>
            <td><?php echo $Coltwo; ?></td>

            <?php foreach ($items as $item ) {
                $itemName = $item->getitemName();?>

                <td>
                    <?php echo $itemName; ?>
                </td>

            <?php } ?>
        </tr>

    <?php}
 ?>

Any help should be appreciated.

Answer 1

Try to append your next iteration in $html variable by using dot ( . )

$html='';
foreach(-------------)
{
$html . = <table>      
<?php if (is_array($t->a)) foreach($t->a as $k => $v) { ?><tr>
<td>k is <?php echo htmlspecialchars($t->k); ?>, and v is <?php echo 
htmlspecialchars($t->v); ?></td>
</tr><?php } ?>
</table>
}

Answer 2

just create one .phtml file your all HTML content in your module view file. Render you html as you want in your custom made phtml file.

Just pass your collection or your data to phtml file like below to process from your controller or anywhere you call this block.

$this->getLayout()->createBlock("Magento\Framework\View\Element\Template")->setTemplate("Magento_Theme::test.phtml")->setYourArrayData($arrayData)->toHtml();

you can get that param to process in your phtml like

   $ArrayofMineData = $block->getYourArrayData();
foreach ($ArrayofMineData as $data){
/* generate your view here */
}

Now you have full HTML to pass it to your $pdf objcet

    $html='';
$html = $this->getLayout()->createBlock("Magento\Framework\View\Element\Template")->setTemplate("Magento_Theme::test.phtml")->setYourArrayData($arrayData)->toHtml();
$tcpdf->writeHTML($html, true, false, true, false, '');