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function to remove tags and/or tag attributes as I specify, and add tag attributes as I specify

Posted on 2006-11-20
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Last Modified: 2013-11-19
Hi,

I need a php function that can allow me to remove tags & tag attributes into/from a string.

I should give the function the string to be processed and an array containing the attributes and attribute properties to be removed.

For example when a tag (<a>) has a style attribute, I want to be able to remove specific style properties for example border & padding, but leave the unspecified ones in tact - and if no attribute properties are specified, the entire attribute needs to be removed.

The function should also remove tags that I specify, including closing tags, and incorrectly opened / closed tags.

The function should work with xhtml & html

The second function should be able to add attributes to specified tags within the given string.  For example: After I stripped all attributes from my <a> tag in the given string, I want to be able to add a rel attribute with for example a nofollow and an external attribute property.

All functions should automatically remove all double tags, hacking attempts, etc... for example it should remove all tags except those I specify as safe, similar to the php strip_tags function.  It should check for things like these:

<!-- I want to put a <div>tag</div> -->
<!-- Or a carrot > -->
<![CDATA[what about this! It's to protect from HTML characters like <tag>, > and so on in XML, no?]]> -->

If I'm not exactly clear on everything, please let me know, but I think this is pretty clear.  The functions will be used primarily to process blog replies.

Thanks for any help!
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Question by:nelwa
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8 Comments
 
LVL 6

Expert Comment

by:aescnt
ID: 17986010
Hi,

If you want to clean up 3rd party HTML (like for blog comments), you'll love this project: http://pixel-apes.com/safehtml/

I don't think it does nofollow or style-stripping, but it does some essential things to HTML to make it 'safe.' (XSS issues and such.) After passing your 3rd party HTML through it, I'm sure you can use regex afterwards to add nofollow and remove styles.
0
 
LVL 1

Author Comment

by:nelwa
ID: 17986075
ok, yes so that function will work to remove xss and such, but now I need something to add attributes and attribute properties to certain tags...
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LVL 1

Author Comment

by:nelwa
ID: 18002449
ok, so is nobody going to help me with this??
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LVL 1

Author Comment

by:nelwa
ID: 18002506
All I need now is a function to remove all tag attributes, and another function that can add attributes with properties to the tags I specify... any help appreciated.

Thanks
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LVL 6

Expert Comment

by:aescnt
ID: 18002516
Sorry, the code required for that is rather too complicated to write quickly.
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LVL 1

Author Comment

by:nelwa
ID: 18002840
I have found a solution to my problem: http://cyberai.com/inputfilter/

Thanks
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