<?php
 
$string = "<td class=x11111111111111111 width=140 style='>1111111111111111111111111111<td>11111111111111border-top:none;border-left:none; width:107pt'>";
 
$doc = new DOMDocument(); 
$doc->loadHTML($string, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);    
$elements = $doc->getElementsByTagName('td'); 
 
foreach ($elements as $element) {
	$attributes = $element->attributes;
	while ($attributes->length) {
        $element->removeAttributeNode($attributes->item(0));
    }
} 
echo $doc->saveHTML(); 

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