(PECL ps >= 1.1.0)
ps_new — Creates a new PostScript document object
Creates a new document instance. It does not create the file on disk or in memory, it just sets up everything. ps_new() is usually followed by a call of ps_open_file() to actually create the postscript document.
Resource of PostScript document 或者在失败时返回 FALSE. The return value
is passed to all other functions as the first argument.