Detailed explanation of the shortcomings of the PHP function strip

Detailed explanation of the shortcomings of the PHP function strip_tags

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Release： 2023-03-14 19:26:01

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This article mainly introduces the relevant information on the detailed explanation of the PHP function strip_tags to handle string defect bugs. Friends in need can refer to it

Detailed explanation of the PHP function strip_tags to handle the string defect bug

PHP function strip_tags() is a commonly used function, which can strip HTML, XML and PHP tags from strings. It greatly facilitates the operation of strings, but the strip_tags() function has bugs. Since strip_tags() cannot verify incomplete or damaged HTML tags, more data will be deleted.

Example:

$str = &#39;<p>string</p>string<string<b>hello</b><p>string</p>&#39;;
 
echo strip_tags($str, &#39;<p>&#39;);

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Output:

<p>string</p>string

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Filter tags through the strip_tags function. In fact, I hope to get the following result:

<p>string</p>stringstring
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As a result, we failed to get the expected result. In fact, Because of the angle bracket to the left of the third string in the string, the strip_tags function accidentally deleted other characters.

After searching for PHP related documents, I found that the strip_tags function has a warning: Since strip_tags() cannot actually verify HTML, incomplete or damaged tags will cause more data to be deleted.

Since the integrity of HTML tags cannot be verified, encountering strings containing "<" or ">" will result in accidentally deleting other characters in the string.
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