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(PECL ps >= 1.1.0)
ps_show_xy — Output text at given position
$psdoc 
   ,  string $text 
   ,  float $x 
   ,  float $y 
   )Output a text at the given text position.
psdoc Resource identifier of the postscript file as returned by ps_new() .
text The text to be output.
x x-coordinate of the lower left corner of the box surrounding the text.
y y-coordinate of the lower left corner of the box surrounding the text.
   成功时返回  TRUE , 或者在失败时返回  FALSE 。