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<?php
$mainImage = imagecreatefromjpeg('jpgFile.jpg');
$mainWidth = imagesx($mainImage);
$mainHeight = imagesy($mainImage);
$thumbWidth = intval($mainWidth / 4);
$thumbHeight = intval($mainHeight / 4);
$myThumbnail = imagecreatetruecolor($thumbWidth, $thumbHeight);
imagecopyresampled($myThumbnail, $mainImage, 0, 0, 0, 0, $thumbWidth, $thumbHeight, $mainWidth, $mainHeight);
header("Content-type: image/jpeg");
imagejpeg($myThumbnail);
imagedestroy($myThumbnail);
imagedestroy($mainImage);
?>
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