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Display the dimensions of an image using the GD library

<?php //this is the image to check , change this if($img = @GetImageSize("testimage.gif")) { //if image exists display the following information echo "image exists , here is some info<br>"; //display width in pixels echo "width = $img[0]<br>"; //display height in pixels echo "height = $img[1]<br>"; } else { //cant find image message echo"image does not exist"; } ?>