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This article mainly explains "PHP filter common tag regular expression code", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's take you to learn "PHP filter regular expression code of common tags"!

We often use PHP to filter some tags, such as filtering link tags, filtering script tags, etc. Here is a look at the regular expression code for PHP filtering common tags:

$str=preg_replace("/\s+/", " ", $str); //filter redundant returns $str=preg_replace("/

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