取自http://www.php.net/manual/zh/book.image.php#93393
$image = imagecreatefromstring($file);
// start buffering
ob_start();
imagepng($image);
$contents = ob_get_clean();
echo "<img src='data:image/png;base64,".base64_encode($contents)."' />";
imagedestroy($image);
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