codeigniter - saving highchart canvas as png image on server -

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i'm wondering has been able save canvas image of highchart onto server. can render highchart on canvas fine, when save server image blank has file size of 6kb. testing purposes i'm hard coding in dataurl of canvas image still can't image show(i'm ruling out fact not case of me not transferring data correctly when generating image). ive tried taking regular dataurl of cloud , image appears fine.

$img = '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';   $data = base64_decode($img);         $file = 'download/image3.png';         $success = file_put_contents($file, $data);         print $success ? $file : 'unable save file.';

anyone know might wrong? need save these images on server because need show them in pdf afterwards can't seem find solution.i'm using code igniter also.


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