PHP popen function

child.php

<?php

/*
 * This is the child process, it'll be launched
 * from the parent process.
 */

/* Do some work */
echo "large process is running";

?>

main.php

<?php
  echo "\n doning the work in Main file\n";
  echo date("h:i:s");echo "\n";
  $commandName="/var/www/html/main.php"; //Provide full path of the php file
  $handle = popen('php ' . $commandName , 'r');
  echo date("h:i:s");


?>