pdf_arc
    (PHP 3 >= 3.0.6, PHP 4, PECL)
pdf_arc -- Draw a counterclockwise circular arc segment
Description
bool 
pdf_arc ( resource p, float x, float y, float r, float alpha, float beta )
      Add a counterclockwise circular arc from
      alpha to beta degrees
      with center (x; y)
      and radius r. The actual drawing of the circle is performed by
      the next stroke or fill operation.