<?php
$str = "<test>sdfaskfsdfkkdf</test>";
$value = preg_replace("/<(test)>(.+)<\/\\1>/isU","\\2", $str);
echo $value;
?>
$str = "<test>sdfaskfsdfkkdf</test>";
$value = preg_replace("/<(test)>(.+)<\/\\1>/isU","\\2", $str);
echo $value;
?>
$value = preg_replace("/<\/?test>/is","", $str);
echo $value;
preg_match("/<test>(.*)<\/test>/isU",$str, $arr);
echo $arr[1];