Description:
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From manual page: http://www.php.net/function.imagescale
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The function imagescale either has an implementation bug floating around or the documentation is wrong.

The issue is with the $height parameter. The docs say it can optionally be provided but the reality is the following error:

Warning: imagescale(): gd warning: one parameter to a memory allocation 
multiplication is negative or zero, failing operation gracefully ...

Link: https://bugs.php.net/bug.php?id=65171

The only way for imagescale() to function properly at present is to explicitly provide a value for $height.

It would be very helpful if the docs gave a warning on this issue.

Test script:
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$imageres = imagecreatetruecolor(600, 500);


$imageres = imagescale($imageres, 380, 380);


imagejpeg($imageres, $dstdir . $filename);
imagedestroy($imageres);