How to tell if Mime type matches contents

[ed_spain]

Hi Everyone,

Before I write the script myself, I'm looking for PHP code that checks
that a link's content type matches it's contents. I need this for my
"broken link" checker script, which fails to spot the "broken" links
http://www.awin1.com/show.php?mid=10...6515&aid=49007 and
http://www.awin1.com/awclick.php?mid...36515&id=49007. Any
ideas?

BTW, in case the links get fixed before you read the message, the first
link is a GIF MIME that returns

[document.write( '<a
href="http://www.affiliatewi ndow.com/?id=.&banner=no "
target="_blank" ><img
src="http://www.awin1.com/show.php?mid=3& gid=14&aid=477& clickref=nobann er"
border="0"></a>')]

which displays as

[The image
"http://www.awin1.com/show.php?mid=10 14&linkid=36515 &aid=49007"
cannot be displayed, because it contains errors.] .

The second is a text/html that returns

[<br />
<b>Warning</b>: mysql_result(): Unable to jump to row 0 on MySQL
result index 30 in <b>/home/sites/site3/web/awclick.php</b> on line
<b>51</b><br />
<br />
<b>Warning</b>: mysql_fetch_arr ay(): supplied argument is not a valid
MySQL result resource in
<b>/home/sites/site3/web/linkdeliveryfun ctions.inc.php</b> on line
<b>178</b><br />
<br />

<b>Warning</b>: mysql_result(): supplied argument is not a valid MySQL
result resource in
<b>/home/sites/site3/web/linkdeliveryfun ctions.inc.php</b> on line
<b>478</b><br />
<br />
<b>Warning</b>: Cannot modify header information - headers already
sent by (output started at /home/sites/site3/web/awclick.php:51) in
<b>/home/sites/site3/web/linkdeliveryfun ctions.inc.php</b> on line
<b>462</b><br />
<br />
<b>Warning</b>: Cannot modify header information - headers already
sent by (output started at /home/sites/site3/web/awclick.php:51) in
<b>/home/sites/site3/web/awclick.php</b> on line <b>235</b><br />
]

Thanks,
Ed

[Andy Hassall]

Re: How to tell if Mime type matches contents

On 27 Dec 2005 07:27:06 -0800, "ed_spain" <ed.eichman@gma il.com> wrote:
[color=blue]
>Before I write the script myself, I'm looking for PHP code that checks
>that a link's content type matches it's contents. I need this for my
>"broken link" checker script, which fails to spot the "broken" links
>http://www.awin1.com/show.php?mid=10...6515&aid=49007 and
>http://www.awin1.com/awclick.php?mid...36515&id=49007. Any
>ideas?
>
>BTW, in case the links get fixed before you read the message, the first
>link is a GIF MIME that returns
>
>[document.write( '<a
>href="http://www.affiliatewi ndow.com/?id=.&banner=no "
>target="_blank "><img
>src="http://www.awin1.com/show.php?mid=3& gid=14&aid=477& clickref=nobann er"
>border="0"></a>')]
>
>which displays as
>
>[The image
>"http://www.awin1.com/show.php?mid=10 14&linkid=36515 &aid=49007"
>cannot be displayed, because it contains errors.] .
>
>The second is a text/html that returns
>
>[<br />
><b>Warning</b>: mysql_result(): Unable to jump to row 0 on MySQL
>result index 30 in <b>/home/sites/site3/web/awclick.php</b> on line
><b>51</b><br />
><br />[/color]

There's MIME-type detection using "magic numbers" available through:

http://uk2.php.net/mime_content_type

This does a quick check against the first few bytes of the file to see if it
matches up with various file formats.

It won't catch the second one, because that's still a valid HTML page - it may
have PHP errors on it, but they're in HTML.

--
Andy Hassall :: andy@andyh.co.u k :: http://www.andyh.co.uk
http://www.andyhsoftware.co.uk/space :: disk and FTP usage analysis tool