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Re: Checking if file is an image [message #170859 is a reply to message #170857]

Sat, 04 December 2010 02:06

Magno
Messages: 49
Registered: October 2010

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Member

On 12/03/2010 10:37 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

¿Why don’t you just better use ob_start(); and buffer any possible error
output?
If no error output, then render the image normally.
If there is error, let yourself know by any way and then exit();

To check if there is any error, I think that a single.-
if (strlen($ob = ob_get_clean())) would do.

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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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