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$subjet = '<?xml version="1.0" encoding="utf-8"?>';
preg_match_all("/encoding=\"(.*)\"\?/is",$subjet,$match);
echo $match[1][0];
echo '<pre>';
var_dump($match);
$subjet = '<?xml version="1.0" encoding="utf-8"?>';
preg_match("/encoding=\"(.*)\"/is",$subjet,$match);
echo $match[1];
preg_match_all('/encoding=\"(.*)\?\"/is', '<?xml version="1.0" encoding="utf-8"?>', $match);
echo $match[1];