(PECL ps:1.1.0-1.3.5)
ps_set_value — Sets certain values
Sets several values which are used by many functions. Parameters are by definition float values.
Resource identifier of the postscript file as returned by ps_new().
The name can be one of the following:
The way how text is shown.
The x coordinate for text output.
The y coordinate for text output.
The distance between words relative to the width of a space.
The distance between lines in pixels.
The value of the parameter.
如果成功则返回 TRUE，失败则返回 FALSE。