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function imageReversal(&$im, $mode=0) {
$x = imagesx($im);
$y = imagesy($im);
$dim = imagecreatetruecolor($x, $y);
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// File
$filename = 'csdn.png';
// Content type
header('Content-type: image/png');
// Load
$source = imagecreatefrompng($file


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