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@ 2017-12-16T18:49:47Z

<?php
$html = '<table id="transactions" class="table">
    <thead>
        <tr>
            <th class="image"></th>
            <th class="title"><span>Title</span></th>
            <th class="date"><span>Date</span></th>
        </tr>
    </thead>
    <tbody>
        <tr class="tbody-tr">
            <td class="image">
                <img src="http://www.example.com/image.jpg">
            </td>
            <td class="title">Title
            </td>
            <td class="date">12/16/2017
            </td>
        </tr>
        <tr class="tbody-tr">
            <td class="image">
                <img src="http://www.example.com/image.jpg">
            </td>
            <td class="title">Title
            </td>
            <td class="date">12/16/2017
            </td>
        </tr>
    </tbody>
</table>';

$doc = new DOMDocument();
$doc->loadHTML($html);
$doc->formatOutput = true;

foreach ($doc->getElementsByTagName('tr') as $tr) {
    
    // insert into thead > th
    if ($tr->childNodes->item(0)->nodeName == 'th') {
        $th = $doc->createElement('th');
        $th->setAttribute('class', 'example');
        $th->nodeValue = 'Example';
        $tr->insertBefore($th, $tr->childNodes->item(3));
    } 
    // insert into body > td
    else {
        $td = $doc->createElement('td');
        $td->setAttribute('class', 'example');

        $tr->insertBefore($td, $tr->childNodes->item(3));
    }
}

echo $doc->saveHTML();

Output for git.master, git.master_jit, rfc.property-hooks: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"> <html><body><table id="transactions" class="table"> <thead><tr> <th class="image"></th> <th class="title"><span>Title</span></th> <th class="example">Example</th> <th class="date"><span>Date</span></th> </tr></thead> <tbody> <tr class="tbody-tr"> <td class="image"> <img src="http://www.example.com/image.jpg"> </td> <td class="title">Title </td> <td class="example"></td> <td class="date">12/16/2017 </td> </tr> <tr class="tbody-tr"> <td class="image"> <img src="http://www.example.com/image.jpg"> </td> <td class="title">Title </td> <td class="example"></td> <td class="date">12/16/2017 </td> </tr> </tbody> </table></body></html>

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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