PHP: Create thumbnail of top left of picture

I have this large png file and now I want to create a thumbnail of the upper left corner.

The png is like 600x1000 pixels, the thumbnail should be top lef开发者_开发技巧t 400x300 pixels of it.

Would be awesome if you can help me out! (Since google only shows how to thumbnail the ENTIRE picture)

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imagecopyresampled( $top_left_image_thumb,       //cropped thumbnail image
                    $original_image,             //original image
                    0, 0, 0, 0,                  //top-left corners
                    $thumb_width, $thumb_height, //dst dimensions 
                    400, 300                     //src subarea dimensions
                   );

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You can use imagecopyresampled function in PHP to copy part of a source image and also scale it to any size you want.

Please check the PHP documentation for the function.

http://www.php.net/manual/en/function.imagecopyresampled.php