(PECL ps >= 1.1.0)
ps_arc — Draws an arc counterclockwise
Draws a portion of a circle with at middle point at (x , y ). The arc starts at an angle of alpha and ends at an angle of beta . It is drawn counterclockwise (use ps_arcn() to draw clockwise). The subpath added to the current path starts on the arc at angle alpha and ends on the arc at angle beta .
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
The start angle given in degrees.
The end angle given in degrees.
如果成功则返回 TRUE，失败则返回 FALSE。