How to remove html code in php

php method to remove html code: 1. Remove HTML tags through "strip_tags(string,allow)"; 2. Use PHP to process the HTML code of the article read from the database, and then use regular expressions to modify the code Just match and modify.

The operating environment of this article: Windows7 system, PHP7.1 version, DELL G3 computer

php example of removing HTML tags

There are many ways to remove HTML tags from strings in PHP. The most commonly used method is to use the strip_tags function to remove all of them. Only the characters are retained, and the remaining characters are selectively removed. We need to use regular expressions. Here are two small examples of removing 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 code read from the database Article HTML code, and then use regular expressions to match and modify the code. After saving the code, 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="" width="245" height="138" onclick="window.open(&#39;xxxx.gif&#39;)" />";
$str = preg_replace(&#39;#onclick=([sS]*)"#&#39;,&#39;&#39;,$str);
// #符号前面有一个双引号要注意,代表结束的代码
print($str);
?>

[Recommended learning: PHP video tutorial]

The above is the detailed content of How to remove html code in php. For more information, please follow other related articles on the PHP Chinese website!