ImageFilledRectangle();

[marcello3000]

in ImageFilledRectangle($img,a,b,c,d,$nero);

cosa sono a b c E d?

[Eyescream]

int imagefilledrectangle ( resource image, int x1, int y1, int x2, int y2, int color)
imagefilledrectangle() creates a filled rectangle of color color in image image starting at upper left coordinates x1, y1 and ending at bottom right coordinates x2, y2. 0, 0 is the top left corner of the image.
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quindi sono (dovrebbero essere) delle costanti numeriche