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php使用正则替换过滤掉js(script)脚本例子

May 25, 2016 pm 04:47 PM

利用php中的preg_replace正则匹配函数过滤掉网页中的js代码,preg_replace()中的第四个参数中表示替换的次数,默认是-1,表示替换全部;如果只想替换2次,可以写为 preg_replace($p1,$p2,$p3,2)。

匹配的规则不能用 "//i",因为它不能匹配到换行符,那么多行js就匹配不掉了。要用 "/<script>/i"。里面的?表示尽可能少重复,也就是匹配最近的一个</script>。

源码范例:

php匹配js

<?php
header("Content-type:text/html;charset=utf-8");
$str = &#39;<script type="text/javascript" src="dd.js"></script>
测试php正则匹配掉js代码<script type="text/javascript" src="123.js"></script>
<script type="text/javascript">
 var aa = "sdsds";
 alert(aa);
</script>
测试php正则匹配掉js代码&#39;;
$preg = "/\script[sS]*?<\/script>/i";
$newstr = preg_replace($preg, "", $str, 3); //第四个参数中的3表示替换3次,默认是-1,替换全部
echo $newstr;
?>
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