(PHP 4, PHP 5 <= 5.0.5)
cpdf_circle — Draw a circle
Draws a circle.
The document handle, returned by cpdf_open().
The x-coordinate of the center
The y-coordinate of the center
The circle radius
The optional parameter mode determines the unit length. If it is 0 or omitted the default unit as specified for the page is used. Otherwise the coordinates are measured in postscript points disregarding the current unit.
如果成功则返回 TRUE,失败则返回 FALSE。