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PHP 
preg_replace('/[x00-x1f]/','',htmlspecialchars($string));
if want to use strtoupper, use it before using htmlspecialchars otherwise it will not workspreg_replace('/[x00-x1f]/','',htmlspecialchars(strtoupper($string)));
for example,'&' => '$amp;'
if use strtoupper after htmlspecialchars ‘$amp;’ will become ‘$AMP;’ and this will be interpreted wrong in xml
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