[Resolved] PHP & GD - Test JPG

simobk

Hi all,

First, let me tell you that I really started using PHP only 2 weeks ago, so sorry if I seem a bit ...noob... 🙂

I created a PHP function that uses the GD library to upload and resize an image.

I would like to know if there is a way to know that the image uploaded is really a JPG (other than checking the extension).

Let me make myself clear. Suppose someone renames a word document from aaa.doc to aaa.jpg and tries to upload it. Is there a way to know that it is not a JPEG before the file is processed?

Thanks,

Simo

kburger

Sure can. Check out getimagesize()

$imgarray = @getimagesize($_FILES['userfile']['tmp_name']);
if ($imgarray[2] != 2) { // not a JPEG
}

simobk

Neat, didn't think about it that way but...

I know imgarray[0] is width and imgarray[1] is height... But what's imgarray[2]?

Sthg else, I will test it when I'm back from my lunch break but I think when the first line of this code will execute, I'll get an invalid type error or sthg like that. That's what I am trying to avoid. I want to show my own error messages.

Thanks,

Simo

simobk

Woops... Sorry, just read the sticky post. The @ sign will avoid all errors from being printed to screen... Wonderful... thanks 😉

The subject may now be close 🙂

kburger

That's why I put the '@' at the beginning of the function call to getimagesize(). This will suppress the error message. Obviously, if PHP tries to get the image attributes from a WORD document or a text file there's going to be an error message.

The third element of that array (index 2) is the type of image. Click on the link in my previous post to read more from the manual.