Analysis of a bug in strip_tags of the PHP function _ PHP Tutorial

Analysis of a bug in the strip_tags function of PHP. The PHP function strip_tags provides the ability to remove HTML and PHP tags from strings. this function attempts to return the given string str to remove null characters, HTML and PHP markup results. The PHP function strip_tags provides the ability to remove HTML and PHP tags from strings. this function attempts to return the given string str to remove null characters, HTML and PHP markup results.

Because strip_tags () cannot actually verify HTML, incomplete or broken tags will cause more data to be deleted.

For example, the following code:

The code is as follows:

String

String Hello

String

Use strip_tags ($ str ,'

') Filter. we may expect the following results:

The code is as follows:

String

String String

The actual operation result is as follows:

The code is as follows:

String

String

All of this is because of the red left angle bracket. I checked the PHP document and gave a warning:

Because strip_tags () cannot actually verify HTML, incomplete or broken tags will cause more data to be deleted.

Since code correctness cannot be verified before filtering is executed, the code after the tag-related character "<" or ">" is all suspended!

The http://www.bkjia.com/PHPjc/774996.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/774996.htmlTechArticlePHP function strip_tags provides the ability to remove HTML and PHP markup from strings, which attempts to return results after the given string str removes null characters, HTML, and PHP markup ....