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 color.
imageAn image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
xx-coordinate of start
yy-coordinate of start
borderThe border color. A color identifier created with imagecolorallocate()
colorThe fill color. A color identifier created with imagecolorallocate()