When i create a image through imlib it not return resource but the gd and imagick return resource how to check the imlib return is resource or not?

sample
========

if(is_resource($a))
echo “<br>is gd resource<br>”;
else
echo “<br>not gd resource<br>”;
echo “imagickresource->”.$b = Imagick_readimage(“redeye.jpg”);
if(is_resource($b))
echo “<br>is imagick resource<br>”;
else
echo “<br>is not imagick resource<br>”;
echo “imlibresource->”.$c = imlib_load_image(“redeye.jpg”);
if(is_resource($c))
echo “<br>is imlib resource<br>”;
else
echo “<br>is not imlib resource<br>”;

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