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@ 2015-11-05T08:48:06Z

<?php

$xml = new SimpleXMLElement('<data/>');
$value="This & That";
$value = preg_replace_callback('/&[^; ]{0,6}.?/', "((substr('\\0',-1) == ';') ? '\\0' : '&amp;'.substr('\\0',1))", trim($value));
$xml->addChild('header', $value);

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
trim: documentation ( source)

preferences:dark modelive preview

51.01 ms | 402 KiB | 5 Q