Image Cropping

[SurgeProto]

Hey all,

 I'm trying to use the following line of code to crop an image:

imagecopyresampled($dst_img,$src_img,0,0,0,0,$new_img_width,$new_img_height,$current_img_width,$current_img_height);

The problem is where I have the zeros. That is supposed to be the necessary x and y coordinates to perform the crop. I can't figure out how to get the proper x and y coordinates. I have also found very little information on this topic, everyone seems to take the easy way out and recommend ImageMagick. I don't have access to this program on the server I'm working on. Any advice is greatly appreciated.

[Weedpacket]

The first two are the coordinates of the upper-left corner of the rectangular region where the cropped image is going to be placed in the destination image.

The second two are the coordinates of the upper-left corner of the rectangular region in the source image that you're cropping; in other words, they indicate how much to trim off the top and left sides of the original image.

If you're just cropping an image down and not compositing it with anything else, then the first two will be 0,0 (so that the cropped image appears hard up against the upper-left corner of the destination image). Now the only work to do is to figure out how much of the original image to trim off.