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I encoded a canvas-image to base64 which gives me this: data:image/jpeg;base64,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 which seems like a valid base64-image (decoded it with an online-decoder). I send this with other (form-) variables with jquery ajax like this: $.ajax({ type: "POST", url: "index.php?action=saveNewPost", data: {text: text, img: encodeURIComponent(base64img)}, contentType: "application/x-www-form-urlencoded;charset=UTF-8", success: function(){ //... } }); on the server this goes to this line: saveImage(utf8_decode($_POST['img'])); which calls: function saveImage($base64img){ define('UPLOAD_DIR', '../uploads/'); $base64img = str_replace('data:image/jpeg;base64,', '', $base64img); $data = base64_decode($base64img); $file = UPLOAD_DIR . uniqid() . '.jpg'; file_pu

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