(PECL ps >= 1.1.0)
ps_circle — Draws a circle
Draws a circle with its middle point at (x, y). The circle starts and ends at position (x+radius, y). If this function is called outside a path it will start a new path. If it is called within a path it will add the circle as a subpath. If the last drawing operation does not end in point (x+radius, y) then there will be a gap in the path.
Resource identifier of the postscript file as returned by ps_new().
The x-coordinate of the circle's middle point.
The y-coordinate of the circle's middle point.
The radius of the circle
成功时返回 TRUE， 或者在失败时返回 FALSE.