Uploading binary files with a form.

[sonnysavage]

The field name of my form is "image". When the form is submitted, part of my logic looks like this:

if ($image) {
	$imageinfo = getimagesize($image);
}

The strange thing is, on my Windows 98 machine (where I develop), the logic works just fine, if an image has not been specified, that code does not execute. On the remote server (Linux), the code inside that if block tries to execute, and throws an error because it tries to

getimagesize()

on an "empty" string.

Is anyone aware of a more reliable way to check this $image variable?

Thanks!

 

[sleipnir214]

Have you tried isset()?

 

[sonnysavage]

I have a solution. isset{} won't work because the variable is set when the form is submitted. file_exists() returns true if the string is null. I can't for the life of me figure out why, maybe it's a bug. I got the solution from one of the user notes for the fopen() function.

Here is what I am doing now:

$image_pointer = @fopen($image, "rb");
if ($image_pointer) {
    $imageinfo = getimagesize($image);
}

$image_pointer will only be set if $image is a valid file path. The '@' symbol suppresses errors.