(PHP 3 <= 3.0.18, PHP 4 >= 4.0.0)
int imagefilltoborder (int im, int x, int y, int border, int col)
ImageFillToBorder() performs a flood fill
whose border color is defined by border.
The starting point for the fill is x,
y (top left is 0, 0) and the region is
filled with color col.