<?php
$a = "<a>河蟹社会afeowahgieawhjozf候蛇fawgwea维稳aghoiawghowi我日</a>";
$result = preg_replace('/([\x80-\xff]*)/i','',$a);
var_dump($result);
正则表达式中/i,/g,/ig,/gi,/m的区别和含义
/i (忽略大小写)
/g (全文查找出现的所有匹配字符)
/m (多行查找)
/gi(全文查找、忽略大小写)
/ig(全文查找、忽略大小写)
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