Drawing a PHP rectangle

[Anon]

I found this function in the PHP library and am interested in learning some graphics:

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int imagerectangle ( int im, int x1, int y1, int x2, int y2, int col)

imagerectangle() creates a rectangle of color col in image im starting at upper left coordinate x1, y1 and ending at bottom right coordinate x2, y2. 0, 0 is the top left corner of the image.

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My question is, what is "im"?

Is this supposed to be some preexisting blank .gif or what to draw on?

[[deleted]]

im is like a filepointer to an image opened or created by the other image functions.

[Anon]

So IOW, I need to call something like imagecreate() first, get the handle returned, and then use this as that parameter?

[Anon]

Yes.