Detailed introduction to regular expressions for filtering common html tags in PHP-PHP Tutorial-php.cn

PHPUse thehtmlentities() function to convert HTML tags into Html entities

Definition and usage
htmlentities() function to convert characters into HTML entities .
Grammar

htmlentities(string,quotestyle,character-set)

Copy after login

PHP: Function to filter html tags (this is the most powerful)

PHP actually has internal functions available for filtering html tags, which is relatively simple. Stronger.

php function to filter html:

strip_tags(string)

Copy after login

This way you can filter out all html tags.

If you want to filter out all html tags except

strip_tags(string,"");

Copy after login

, you can write like this:

xxx

Copy after login

To filter out all html tags except

strip_tags(string," ");

Copy after login

, you can write like this ：

$str=preg_replace("/\s+/", " ", $str); //过滤多余回车 $str=preg_replace("/<[ ]+/si","<",$str); //过滤<("<"号后面带空格) $str=preg_replace("/<\!–.*?–>/si","",$str); //注释 $str=preg_replace("/<(\!.*?)>/si","",$str); //过滤DOCTYPE $str=preg_replace("/<(\/?html.*?)>/si","",$str); //过滤html标签 $str=preg_replace("/<(\/?head.*?)>/si","",$str); //过滤head标签 $str=preg_replace("/<(\/?meta.*?)>/si","",$str); //过滤meta标签 $str=preg_replace("/<(\/?body.*?)>/si","",$str); //过滤body标签 $str=preg_replace("/<(\/?link.*?)>/si","",$str); //过滤link标签 $str=preg_replace("/<(\/?form.*?)>/si","",$str); //过滤form标签 $str=preg_replace("/cookie/si","COOKIE",$str); //过滤COOKIE标签 $str=preg_replace("/<(applet.*?)>(.*?)<(\/applet.*?)>/si","",$str); //过滤applet标签 $str=preg_replace("/<(\/?applet.*?)>/si","",$str); //过滤applet标签 $str=preg_replace("/<(style.*?)>(.*?)<(\/style.*?)>/si","",$str); //过滤style标签 $str=preg_replace("/<(\/?style.*?)>/si","",$str); //过滤style标签 $str=preg_replace("/<(title.*?)>(.*?)<(\/title.*?)>/si","",$str); //过滤title标签 $str=preg_replace("/<(\/?title.*?)>/si","",$str); //过滤title标签 $str=preg_replace("/<(object.*?)>(.*?)<(\/object.*?)>/si","",$str); //过滤object标签 $str=preg_replace("/<(\/?objec.*?)>/si","",$str); //过滤object标签 $str=preg_replace("/<(noframes.*?)>(.*?)<(\/noframes.*?)>/si","",$str); //过滤noframes标签 $str=preg_replace("/<(\/?noframes.*?)>/si","",$str); //过滤noframes标签 $str=preg_replace("/<(i?frame.*?)>(.*?)

Copy after login

Regular expressions for PHP to filter common html tags

### In php project development, some regular expressions for filtering html tags are often used, save them for later use :###rrreee

The above is the detailed content of Detailed introduction to regular expressions for filtering common html tags in PHP. For more information, please follow other related articles on the PHP Chinese website!