(PECL ps >= 1.1.0)
ps_show2 — Output a text at current position
$psdoc
   , string $text
   , int $len
   )
   Output text at the current position. Do not print more than len characters.
  
psdocResource identifier of the postscript file as returned by ps_new().
textThe text to be output.
lenThe maximum number of characters to print.
   成功时返回 TRUE, 或者在失败时返回 FALSE。