(PECL ps >= 1.1.0)
ps_show2 — Output a text at current position
$psdoc, string $text, int $len): bool
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。