Method sharing of php regular deletion of class style attributes in html code

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1. Question:

The code is as follows:

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Requirement: remove the class attribute from the HTML code.

Second, the realization method:

The php implementation code is as follows:

Welcome to $str=''; $str=preg_replace ('/ class= "([^\"] *) "/ isU','',$str); echo $str

Running result:

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