How to invoke/start a Process in PHP and kill it using Process ID

**Getting Correct Process ID:-
<?php
//Get Operating System
$OperatingSystem = php_uname('s');
if($OperatingSystem == "Windows NT") {
//**Works only for PHP 4 and above. proc_get_status() does not return correct PID so
//work around is used as shown below..
$descriptorspec = array (
0 => array("pipe", "r"),
1 => array("pipe", "w"),
);

//proc_open — Execute a command
//'start /b' runs command in the background
if ( is_resource( $prog = proc_open("start /b " . $runPath, $descriptorspec, $pipes, $startDir, NULL) ) )
{
//Get Parent process Id
$ppid = proc_get_status($prog);
$pid=$ppid['pid'];
}
else
{
echo("Failed to execute!");
exit();
}
$output = array_filter(explode(" ", shell_exec("wmic process get parentprocessid,processid | find \"$pid\"")));
array_pop($output);

//Process Id is
$pid = end($output);
}
else if($OperatingSystem == "Linux") {

//**Works only for PHP 4 and above. proc_get_status() does not return correct PID so
//work around is used as shown below..
$descriptorspec = array (
0 => array("pipe", "r"),
1 => array("pipe", "w"),
);

//proc_open — Execute a command
//'nohup' command line-utility will allow you to run command/process or shell script that can continue running in the background
if (is_resource($prog = proc_open("nohup " . $runPath, $descriptorspec, $pipes, $startDir, NULL) ) )
{
//Get Parent process Id
$ppid = proc_get_status($prog);
$pid=$ppid['pid'];

//Process Id is
$pid=$pid+1;

}
else
{
echo("Failed to execute!");
exit();
}
}
?>


** To Kill Windows or Linux process:-

<?PHP
$OperatingSystem = php_uname('s');
if($OperatingSystem == "Windows NT") {
//'F' to Force kill a process
exec("taskkill /pid $pid /F");
}
else if($OperatingSystem == "Linux") {
exec("kill -9 $pid");
}

?>