OrderSprinter-Forum

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        private static function scaleImg($fn,$maxDim) {
                list($width, $height, $type, $attr) = getimagesize($_FILES['imagefile']['tmp_name']);
                        $size = getimagesize($fn);
                        $ratio = $size[0] / $size[1]; // width/height


                        if ($ratio = 1) {           // width/height = 1
                                $width = $maxDim;   // leave width
                                $height = $maxDim;  // leave height
                        }
                        if ($ratio > 1) {                   // width/heigth > 1
                                $width = $maxDim;           // leave width
                                $height = $maxDim / $ratio; // calculate new height
                        }
                        if ($ratio < 1) {                   // width/height < 1
                                $width = $maxDim * $ratio;  // calculate new width
                                $height = $maxDim;          // leave height
                        }

                        $src = imagecreatefromstring(file_get_contents($fn));
                        $dst = imagecreatetruecolor($width, $height);
                        imagealphablending($dst, false);
                        imagesavealpha($dst, true);
                        $transparent = imagecolorallocatealpha($dst, 255, 255, 255, 127);
                        imagefilledrectangle($dst, 0, 0, $width, $height, $transparent);

                        imagecopyresampled($dst, $src, 0, 0, 0, 0, $width, $height, $size[0], $size[1]);
                        imagedestroy($src);
                        ob_start();
                        imagepng($dst); // adjust format as needed
                        $imagedata = ob_get_contents();
                        ob_end_clean();
                        imagedestroy($dst);
                        return $imagedata;
        }
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