


PHP Programming Guide: Use regular expressions to clear HTML code
HTML is a markup language commonly used in web development, but sometimes We need to process the HTML code and extract the plain text content. In PHP programming, regular expressions can be used to clear HTML code to get the plain text information we want. This article will introduce how to use regular expressions to clean HTML code in PHP and provide specific code examples.
1. Use regular expressions to clear HTML tags
In PHP, we can use regular expressions to match and replace tags in HTML code to obtain plain text content. The following is a sample code that demonstrates how to clear HTML tags:
$html = '<p>Hello, <strong>world</strong>!</p>'; $text = preg_replace('/<[^>]*>/', '', $html); echo $text;
In this code, we first define a string containing HTML tags $html
, and then use the preg_replace
function to match the regular expression /]*>/
to replace the HTML tags in the string with empty strings, and finally output plain text content.
2. Clear attributes in HTML tags
Sometimes we need to clear attributes in HTML tags and only keep the tag itself. The following example code shows how to clear attributes in HTML tags:
$html = '<a href="https://example.com" title="Link">Click here</a> ;'; $text = preg_replace('/<([a-z][a-z0-9]*)[^>]*>/i', '<$1>', $html); echo $text;
In this example, we use the preg_replace
function with the regular expression/]*>/i
to clear the attributes in the HTML tag, leaving only the tag name, and the final output is <a>Click here</a>
.
3. Clear HTML escape characters
In addition to clearing HTML tags, sometimes we also need to clear escape characters in HTML code to obtain cleaner plain text content. Here is a sample code:
$html = 'It's a beautiful day & the sun is shining.'; $text = html_entity_decode($html); echo $text;
In this code, we use the html_entity_decode
function to restore the escape characters in HTML, and the final output is It's a beautiful day & the sun is shining .
.
Conclusion
Through the above examples, we have learned how to use regular expressions to clear HTML code and obtain plain text content in PHP programming. Using regular expressions allows us to flexibly process HTML strings and extract the information we need. In actual development, regular expressions can be adjusted according to specific needs to achieve a more precise cleaning effect. I hope this article is helpful to you, and happy programming!
The above is the detailed content of PHP Programming Guide: Using Regular Expressions to Clean HTML Code. For more information, please follow other related articles on the PHP Chinese website!

本篇文章带大家了解一下HTML(超文本标记语言),介绍一下HTML的本质,HTML文档的结构、HTML文档的基本标签和图像标签、列表、表格标签、媒体元素、表单,希望对大家有所帮助!

不算。html是一种用来告知浏览器如何组织页面的标记语言,而CSS是一种用来表现HTML或XML等文件样式的样式设计语言;html和css不具备很强的逻辑性和流程控制功能,缺乏灵活性,且html和css不能按照人类的设计对一件工作进行重复的循环,直至得到让人类满意的答案。

总结了一些web前端面试(笔试)题分享给大家,本篇文章就先给大家分享HTML部分的笔试题(附答案),大家可以自己做做,看看能答对几个!

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html5支持boolean值属性;boolean值属性指是属性值为true或者false的属性,如input元素中的disabled属性,不使用该属性表示值为flase,不禁用元素,使用该属性可以不设置属性值表示值为true,禁用元素。


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