<?php
$tag = '<string name="abs__action_bar_home_description">My old title</string>';
$new_title = 'My new title';
$dom = new DOMDocument('1.0', 'UTF-8');
@$dom->loadHTML($tag, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($dom);
$links = $xpath->query('//string[@name="abs__action_bar_home_description"]');
foreach($links as $link) {
$link->nodeValue = $new_title;
}
echo $dom->saveHTML();
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