how to create a base64encoded string from image resource

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Taken from http://www.php.net/manual/en/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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