(PECL ps >= 1.1.0)
ps_show_xy — Output text at given position
Output a text at the given text position.
Resource identifier of the postscript file as returned by ps_new().
The text to be output.
x-coordinate of the lower left corner of the box surrounding the text.
y-coordinate of the lower left corner of the box surrounding the text.
如果成功则返回 TRUE，失败则返回 FALSE。