php - How can I determine why imageCopyResampled is failing? -

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i calling php's imagecopyresampled() function , failing. i'm not sure why (i looked closely @ code , don't see obvious errors passing in empty or non-numeric values, , know source image there, etc.).

so i'm not asking how solve problem, rather can diagnose it, since function returns true or false. don't see errors or warnings being outputted page or in error log, , calling error_get_last() returns nothing.

any ideas?


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