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(PECL ps >= 1.1.0)
ps_circle — Draws a circle
$psdoc 
   ,  float $x 
   ,  float $y 
   ,  float $radius 
   )
   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.
   
psdoc Resource identifier of the postscript file as returned by ps_new() .
x The x-coordinate of the circle's middle point.
y The y-coordinate of the circle's middle point.
radius The radius of the circle
   成功时返回  TRUE , 或者在失败时返回  FALSE 。