checking if it's image or flash

[Anon]

How to check if an image is .gif or .swf file???

[Anon]

do a substr (think thats the function) to chop off the last three chars... The just use if's etc etc...

[chowdary]

Hi,
You can verify whether it's GIF or SWF file by knowing the extention of the file

$file_ext=strtolower(str_replace(".","",strrchr($filename,"."));

With this you will get the extention of the file(lower case).

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Description of above functions:
strrchr($string) gives end part of the string starting with last "."
str_replace($find,$replace,$string)

replace the "." with empty("")

Now you check the value of $file_ext using IF condition isn't it?

Hope you got it

[mithril]

kid,

Are you checking the image type on an uploaded file, or one stored locally on your server? If it's an uploaded file, just looking at the extension is pretty insecure and not too accurate. For example, I can upload anything I want as long as I rename the extension to either .gif or .swf. For uploaded files, use the $HTTP_POST_FILES array. The $HTTP_POST_FILES[field_name][type] element will give you the mime-type of the uploaded file which is much harder to fake. If it's files on the server's drive though the extension method should be good enough (one assumes that you're not going to put malicious files on your own server🙂. HTH.

Cheers,

Geoff A. Virgo

[Anon]

Thanks to all of you