如何用PHP编写代码去除网页中的HTML标签？

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php

<? function Text2Html($txt){ $txt = str_replace(" ","　",$txt); $txt = str_replace("<","&lt;",$txt); $txt = str_replace(">","&gt;",$txt); $txt = preg_replace("/[rn]{1,}/isU"," rn",$txt); return $txt; } ?>