(PECL ps >= 1.1.0)
ps_set_parameter — Sets certain parameters
$psdoc
   , string $name
   , string $value
   )Sets several parameters which are used by many functions. Parameters are by definition string values.
psdoc
     Resource identifier of the postscript file as returned by ps_new().
name
     For a list of possible names see ps_get_parameter().
value
     The value of the parameter.
   Returns TRUE on success or FALSE on failure.