tiny image uses too much memory - how is that possible?

ppowell

I have an image that's only 100K in size, and I am working with 8mb of memory. If I do this:

print_r(ceil((int)ini_get('memory_limit') * 10 * filesize(actual_path("$locationPath/$this->fileName")) / 1000000) . 'M'); // PRINTS OUT "2M" for 2mb

The image itself requires far less than the maximum amount of memory required.

However, the moment I do this:

		$imagestring = @file_get_contents(actual_path(realpath("$locationPath/" . $this->{$section . '_name'})));

It locks up and forces a download of "index.php" (which indicates to me that the memory allotment of 8mb has been used up).

How in the world can a 100KB image that uses only 2mb of 8mb use up 8mb of memory on file_get_contents() alone? I'm completely confused!

Thanx
Phil

MarkR

ppowell wrote:
It locks up and forces a download of "index.php" (which indicates to me that the memory allotment of 8mb has been used up).

How exactly did you determine that?

What errors do you get on the PHP error log?

The amount of memory an image takes up is usually no more than, but may be as much as, (width height 3) bytes, and isn't related to the original file size because the original file may have been compressed.

Mark

ppowell

There is nothing in the PHP error log to tell me one thing or another, just that I had this happen before and increasing memory fixed it beforehand, but I can't increase memory based upon anything meaningful in this case

And I am increasing memory now by $width $height 3 and I get 90000, which is still far less than 8mb

Phil

ClarkF1

The 90000 is 90000 bytes = 87KB not 90000 KB which is 87MB which would explain why a 100KB image is causing problems if the current limit is set at 87KB

ppowell

I'm sorry but I know 90000 ~= 87KB

Phil