Problem with imagecreatefrompng (PHP)

Question

in one of my PHP projects, imagecreatefrompng complains, that the image "is not a valid PNG file".

Warning: imagecreatefrompng() [function.imagecreatefrompng]:
'/.../...png' is not a valid PNG file in /.../...php on line ...

I'm pretty sure, the file is valid, because I can open it in any program. So I was wondering what else could cause this warning.

Does anybody know the details behind imagecreatefrompng or has had a similar problem before?

Thanks for your help,

Timo

@Timo Welcome to SO. Instead of putting SOLVED in the title of your question, click the green checkmark next to the answer below. — Mike B, Feb 19 '10 at 13:47

score 15 · Accepted Answer · answered Feb 19 '10 at 11:32

15

Is it a PNG image? Run file against it, or try the fileinfo functions.

answered Feb 19 '10 at 11:32

Ignacio Vazquez-Abrams

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Thanks for the link to the fileinfo functions. I let PHP check the mime type and surprisingly enough the image was a jpg file - renaming it to .jpg solved the problem. I guess every program I opened the file with automatically detected the mime type correctly... – Timo Feb 19 '10 at 12:01
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I still get the same error after checking with those functions and getting the expected values: "PNG image, 873 x 361, 8-bit/color RGBA, non-interlaced" – spuas Sep 25 '12 at 15:32
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@spuas: Then you have a different problem. – Ignacio Vazquez-Abrams Sep 25 '12 at 15:52

score 3 · Answer 2 · edited Dec 01 '17 at 08:57

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Check this mime type of file you are going to upload by using below function:

mime_content_type($_FILES['product_img']['tmp_name'])

Image editors can often recognize file type by its contents, php might just try to use the file based on its mime-type. If it don't match then there's an error.

edited Dec 01 '17 at 08:57

entio

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answered Dec 01 '17 at 07:07

jalpa

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Problem with imagecreatefrompng (PHP)

2 Answers2