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Display the dimensions of an image using the GD library

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"; 
} 
?>