(PECL ps >= 1.1.0)
ps_setfont — Sets font to use for following output
Sets a font, which has to be loaded before with ps_findfont() . Outputting text without setting a font results in an error.
Resource identifier of the postscript file as returned by ps_new() .
The font identifier as returned by ps_findfont() .
The size of the font.
TRUE ， 或者在失败时返回