Question

php如何处理html标签？

如图，页面上直接把html标签显示出来了，而没有生效。如何处理

Answer 1

php正则过滤html标签、空格、换行符的代码

$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

$str=preg_replace("/<(i?frame.*?)>(.*?)<(\/i?frame.*?)>/si","",$str);
//过滤frame标签
$str=preg_replace("/<(\/?i?frame.*?)>/si","",$str);
//过滤frame标签

$str=preg_replace("/<(script.*?)>(.*?)<(\/script.*?)>/si","",$str);
//过滤script标签
$str=preg_replace("/<(\/?script.*?)>/si","",$str);
//过滤script标签
$str=preg_replace("/javascript/si","Javascript",$str);
//过滤script标签
$str=preg_replace("/vbscript/si","Vbscript",$str);
//过滤script标签
$str=preg_replace("/on([a-z]+)\s*=/si","On\\1=",$str);
//过滤script标签
$str=preg_replace("/

Answer 2

需要用到一个函数实现，htmlentities,就是将字符串转换成html实体，用法你可以查一下php手册,同时它还有个反函数，htmlspecialchars_decode

Answer 3

你要处理的标签是什么？能描述的详细点吗？

是指php和html混合吗？那就
php归php
html归html
祝你成功！

Answer 4

用htmlspecialchars函数试试
$new = htmlspecialchars("<a href='test'>Test</a>", ENT_QUOTES);
echo $new; // <a href='test'>Test</a>

Answer 5

PHP 里不要用 htmlentities 就可以了。。