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Re: Checking if file is an image [message #170863 is a reply to message #170857]

Sat, 04 December 2010 03:34

Jerry Stuckle
Messages: 2598
Registered: September 2010

Karma:

Senior Member

On 12/3/2010 8:37 PM, jwcarlton wrote:
> I have a section that shows an uploaded image. I was doing this:
>
> list($width, $height, $type, $attr) = @getimagesize("/path/to/
> $image");
>
> if (!$width) {
> $image = "noimage.gif";
> $width = "75";
> $height = "95";
> }
>
> I understand that error suppression has a bit of a performance hit,
> though, so I'm curious if either of these would be better:
>
> if (is_readable("/path/to/$image"))
> list($width, $height, $type, $attr) = @getimagesize("/path/to/
> $image");
>
> if (getimagesize("/path/to/$image"))
> list($width, $height, $type, $attr) = @getimagesize("/path/to/
> $image");
>
>
> Either would still be followed with "if (!$width)...". I know that
> neither are fool-proof because they don't check that someone didn't
> rename an .xls or .exe to .jpg, but I can probably control that better
> on the upload side than checking here on every page load. Here, I'm
> more concerned with speed, and not showing any error messages for
> faulty images.
>
> TIA,
>
> Jason

You're prematurely optimizing (again). Unless you're getting 10K
hits/second on your server, you won't notice the difference.

Write your code in a way that is understandable and maintainable. Once
you get the site up (and ONLY then), see if you have a performance
problem. If you do (there's 99.99% chance you won't), find the cause of
the problem and fix it.

But right now you're spending a lot of time worrying about something
that almost assuredly won't be a problem.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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[Message index]

		Checking if file is an image By: jwcarlton on Sat, 04 December 2010 01:37
		Re: Checking if file is an image By: Magno on Sat, 04 December 2010 02:06
		Re: Checking if file is an image By: jwcarlton on Sat, 04 December 2010 02:38
		Re: Checking if file is an image By: Michael Fesser on Sat, 04 December 2010 11:39
		Re: Checking if file is an image By: Magno on Sat, 04 December 2010 15:10
		Re: Checking if file is an image By: Jerry Stuckle on Sat, 04 December 2010 03:34
		Re: Checking if file is an image By: Michael Fesser on Sat, 04 December 2010 11:39
		Re: Checking if file is an image By: The Natural Philosoph on Sat, 04 December 2010 19:19

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