printing a pdf file from php

[ryanf]

Hello, I need some help with printing pdf files through php. I have a
script that will create many pdf files but I want them printed. I
found this program to print pdf from the command line from

http://forum.planetpdf.com/webboard/wbpx.dll/read?142106,52

and it works fine when I do the command

C:\pdfp -p "\\computer\Las erJet" "C:\Program
Files\xampp\htd ocs\weeklyhomeb uyers\temp\invo ice4.pdf"

through start->run but when I try to do it through php using

function print_file($fil ename) {
$adobe_path='C: \pdfp -p "\\\computer\La serJet"';
$output = shell_exec($ado be_path.' "'.$filename.'" ');
echo $output;
}

print_file("C:\ Program
Files\\xampp\ht docs\weeklyhome buyers\\temp\in voice4.pdf");

I get this for the output:
Printer: "\\rzfarrell\La serJet" Printing: C:\Program
Files\xampp\htd ocs\weeklyhomeb uyers\temp\invo ice4.pdf 1 File(s) Printed

but nothing happens. Anyone have any ideas?