PHP image resizing not working. Is there a file size limit?

I'm using a simple image manager class, and the following code:

<?php
include('SimpleImage.php');
$image = new SimpleIma开发者_开发问答ge();
$image->load($target_path);
if($image->getWidth() > 500) {
    $image->resizeToWidth(500);
    echo "<p>Image Resized</p>";
} else echo "<p>Image did not need to be resized.</p>";
$image->save($target_path);
echo "<p>Image Saved</p>";
?>

The image is successfully resized when I upload an image with a width of 700, but when I upload a really big picture (width ~= 2300), it doesn't work, and I don't see any of my echo messages.

Do certain php image functions have a size limit that might be causing this?

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You are most likely hitting the memory_limit setting specified in php.ini.

Add error_reporting(E_ALL); to your script and see what the output is.

Use phpinfo() to find out the current memory limit setting.

It can sometimes be changed using ini_set("memory_limit", xyz). Otherwise, you need to change php.ini.

A 2300 x 2300 Pixel image is going to take up at least

2300 x 2300 x 3 = 15,870,000

= roughly 16 Megabytes of RAM (or 2300 x 2300 x 4 if there's an alpha channel) so I'd say you would need at least 24 Megabytes of RAM per script to make this work well. Maybe even more.

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Check your error log. The chances are that you're exceeding the memory limit (memory_limit in the ini settings). Try adding ini_set('memory_limit', '32M'); to the top of the file.

And to directly answer your question, no there is no size limit on the internal functions...

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There is an upload file size limit ; you can to set it in your php.ini :

upload_max_filesize
post_max_size