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Doc Bug #42864 strip_tags() doesn't work as expected with PHP tags
Submitted: 2007-10-05 10:37 UTC Modified: 2007-11-21 15:08 UTC
From: kraghuba at in dot ibm dot com Assigned:
Status: Not a bug Package: Documentation problem
PHP Version: 5.2.4 OS: windows XP,linux
Private report: No CVE-ID: None
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From: kraghuba at in dot ibm dot com
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 [2007-10-05 10:37 UTC] kraghuba at in dot ibm dot com 
Description:
------------
when a string with PHP tag(<?php ?>) is given as input to strip_tags() function, it strips off the entire given string including the tags. Whereas, the function should only strip the tags and not the text within the PHP block.

As per the documentation, this seems to be non-documented behavior, is this expected? 

Reproduce code:
---------------
<?php
var_dump(strip_tags("<?php echo \"hello\" ?>"));
?>

Expected result:
----------------
string(12) "echo "hello""

Actual result:
--------------
string(0) ""

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 [2007-10-05 10:39 UTC] kraghuba at in dot ibm dot com 
This behavior is found on php6 as well.
 [2007-10-06 00:00 UTC] jani@php.net 
According to the sources this is expected behaviour.
And it's pretty simple, <?php $foo=1; ?> is just another tag. So it's stripped as would something like <img src="foo.gif" /> be sripped..
 [2007-10-08 11:01 UTC] rquadling@php.net 
What is missing though is a way to preserve the PHP "tag".

Just as HTML comments are always removed, PHP code will be also.

Both the HTML comments and PHP "tags" fail to match the usual formats of HTML tags ...

<tag></tag> or <tag />

So

<!-- xxxx -->
<?php xxxx ?>

are not capable of being described for allowable_tags.
 [2007-11-21 15:08 UTC] vrana@php.net 
strip_tags() works exactly as documented: "This function tries to return a string with all HTML and PHP tags stripped".
 
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