HTML validation

[dejitaru]

I'm writing a guestbook
How would I verify that all HTML tags have been closed?
Is there some PHP function that will do this automatically?

 

[Superwormy]

http://www.google.com/search?sourceid=navclient&ie=UTF-8&oe=UTF-8&q=html+validator

 

[BillinSDCA]

Here's a validation site:

The W3C MarkUp Validation Service

Bill

 

[dejitaru]

Originally posted by: Superwormy
http://www.google.com/search?sourceid=navclient&ie=UTF-8&oe=UTF-8&q=html+validator

Aren't you a riot.
I was looking for an algorithm. None of those had the source code available.

 

[igowerf]

I was writing something similar to for posting news updates on my website. I considered using forum style tags like the ones we use here at Anandtech instead and then converting them to HTML. Then I would parse the input for <'s and >'s to make sure to replace those with HTML character codes. That way, any HTML that I or anyone types, would end up looking like &bla;table&bla2; instead of </table>. The HTML code that you enter is rendered useless because the < and > sign's are converted to HTML character codes.

EDIT: Fixed my link.

 

[dejitaru]

I want some HTML functionality, but I want to make certain all tags are closed so that they don't spill into other posts.

 

[dejitaru]

Bah, I could just append </every></close></tag> to the end of messages.

 

[notfred]

parse the input for anything matching /<([A-zA-z]+).*?>/ and then search for a corresponding /<\/$1>/ to close it. Make sure that the number of opening and closing brackets are the same.

 

[Barnaby W. Füi]

Seems like a job for a stack. For every tag of a certain kind, push the stack, for every closing tag, pop back. If there are any stacks with something in them at the end, throw up an error.