php中怎么把超文本链接取消

$str = preg_replace("/<a[^>]*href=[^>]*>|<\/[^a]*a[^>]*>/i","",$strhtml);

<?php
ereg_replace(&#39;<a([^>]*)>([^<]*)</a>&#39;,&#39;<font color="red">\\2</font>&#39;,$content);
ereg_replace("<a [^>]*>|<\/a>","",$content);

<?php
$find="this string is my find";
$string=&#39;<font color="red">替换掉了</font>&#39;;//将超链接替换成的内容
echo ereg_replace(&#39;<a([^>]*)>([^<]*&#39;.$find.&#39;[^>]*)</a>&#39;,&#39;<font color="red">\\2</font>&#39;,$content);

<?php
//方法一
preg_match_all(&#39;/<(a|a)[s]{0,1}[w=":()]*>[nrn]*(check user)[nrn]*</(a|a)>/i&#39;,$string,$matches);
//方法二
preg_match_all(&#39;/<a[dd]*>check user</a>/i&#39;,$string,$matches);
print_r($matches);
//方法三
preg_match_all(&#39;/<a[^>]*>[^<]*</a>/i&#39;,$string,$matches);
print_r($matches);
//方法四
preg_match_all(&#39;/<a.+?>check user</a>/is&#39;,$str,$arr);
print_r($arr);
//方法五
preg_match_all(&#39;/<a.+?>check user</a>/is&#39;,$str,$arr);
print_r($arr);