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PHP – Image Submission

When submitting a form, it is possible to use an image instead of the standard submit button with a tag like:

<input type=”image” src=”image.gif” name=”sub” />

When the user clicks somewhere on the image, the accompanying form will be transmitted to the server with two additional variables, sub_x and sub_y. These contain the coordinates of the user click within the image. The experienced may note that the actual variable names sent by the browser contains a period rather than an underscore, but PHP converts the period to an underscore automatically.