How to clear html tag code in php

php method to remove html tags: 1. Use the function that comes with php to remove it. The function is [strip_tags(string,allow)]; 2. Use PHP to process the article HTML code read from the database. And use regular expressions to match and modify the code. After saving the code, use the static generation function.

The operating environment of this tutorial: windows7 system, html5&&PHP5.6 version, DELL G3 computer.

How to clear html tags in php:

Example 1. PHP’s built-in function can remove/delete HTML tags/codes in strings.

strip_tags(string,allow): Function strips HTML, XML and PHP tags.

Parameters: string, required, specifies the string to be checked; allow, optional, specifies the tags that are allowed to exist, and these tags will not be deleted.

The code is as follows:

$str = &#39;郭碗瓢盆-<span style="color:#f00;">PHP</span>&#39;;
$str1 = strip_tags($str);          // 删除所有HTML标签
$str2 = strip_tags($str,&#39;<span>&#39;); // 保留 <span>标签
echo $str1; // 输出 郭碗瓢盆-PHP
echo $str2; // 样式不一样喔

Example 2. Clear certain attribute codes in the HTML tag string

Use PHP to process the HTML code of the article read from the database, and then use regular expressions to match and modify the code. After saving the code, you can use the static generation function to generate the modified HTML page.

Because the code we generate is already processed code, it will not affect the loading speed of the HTML page.

The specific [sample code] is as follows:

The code is as follows:

<?php
$str = "<img  src="/static/imghwm/default1.png"  data-src=""    style="max-width:90%"lazy"   width="245"  style="max-width:90%" onclick="window.open(&#39;xxxx.gif&#39;)" / alt="How to clear html tag code in php" >";
$str = preg_replace(&#39;#onclick=([sS]*)"#&#39;,&#39;&#39;,$str);
// #符号前面有一个双引号要注意,代表结束的代码
print($str);
?>

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