我如何从exec PHP打印文档pdf？

Question

I am trying to print a pdf document from exec function with a .bat file :

$resultado=exec("test.bat");

The .bat file content is:

start AcroRd32.exe /p /h "C:\documents\documento.pdf" "\\direccion_ip
ombre_impresora"
taskkill /im AcroRd32.exe

When I open the .bat file, this prints, but not when I send the command via php.

Also, I tried with popen :

$bat_filename = "C:\\printer.bat";

if( pclose(popen($bat_filename, 'r')) ) 
    echo "print";
else
  echo "no print ";

The content printer.bat is :

C:\\Program Files (x86)\\Adobe\\Acrobat Reader DC\\Reader\\AcroRd32.exe /p /h "C:\documents\document.pdf" "\\path_printer\printer_name"

What is the problem?