webpage link validation

What's the simplest way to test if a link is valid?

I've got a script that throughly checks the dns, etc. But, I'd also like to
check to see if the user has inputted a valid link to a webpage.

File_exists() and etc. seem to have a lot of caveats.

E.g., foo.com/bar/file.txt

Most things I've looked at are gross overkill.

Al........

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Re: webpage link validation

On Mon, 2009-09-21 at 14:42 -0400, Al wrote:
> What's the simplest way to test if a link is valid?
>
> I've got a script that throughly checks the dns, etc. But, I'd also like to
> check to see if the user has inputted a valid link to a webpage.
>
> File_exists() and etc. seem to have a lot of caveats.
>
> E.g., foo.com/bar/file.txt
>
> Most things I've looked at are gross overkill.
>
> Al........
>

Several ways that I can think of:

* use the file_get_contents() which like you said, could be
overkill
* shell out to wget to retrieve just the headers for the path.
You'd be looking for a 200 return code, which indicates the URI
exists.
* lastly, you could use fopen() to open the file, and use the
return from the fopen() call to indicate a success of failure

Thanks,
Ash
http://www.ashleysheridan.co.uk




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RE: webpage link validation

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=20
> Several ways that I can think of:
>=20
> * use the file_get_contents() which like you said=2C could be
> overkill
> * shell out to wget to retrieve just the headers for the path.
> You'd be looking for a 200 return code=2C which indicates the URI
> exists.
> * lastly=2C you could use fopen() to open the file=2C and use the
> return from the fopen() call to indicate a success of failure
>=20
> Thanks=2C
> Ash

you forgot probably the best one=2C an HEAD call via curl library ( http://=
uk3.php.net/curl ) if present

Regards

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