Ending a shell_exec process PHP - php

Question

been trying to figure this one out for a couple of hours now. No luck.
I am trying to build a system that can run reports (running scripts in the background) using shell_exec.
The following code starts the script that runs the report:
shell_exec("php /var/www/html/lab-40/test/invoice_reminder.php");
Now how would I go about ending that script execution using PHP?
I've tried things like PIDS but I have no clue how I would go about this. Thanks for the help in advance!
EDIT: I am not trying to end the process if the e.g tab is closed.

Answer 1

Based on this comment on shell_exec help page (& will bring the process to the background, and echo $! will print the process PID):
<?php
function shell_exec_background(string $command): int {
return (int)shell_exec(
sprintf(
'nohup %s 1> /dev/null 2> /dev/null & echo $!',
$command
)
);
}
function is_pid_running(int $pid): bool {
exec(
sprintf(
'kill -0 %d 1> /dev/null 2> /dev/null',
$pid
),
$output,
$exit_code
);
return $exit_code === 0;
}
function kill_pid(int $pid): bool {
exec(
sprintf(
'kill -KILL %d 1> /dev/null 2> /dev/null',
$pid
),
$output,
$exit_code
);
return $exit_code === 0;
}
$pid = shell_exec_background('php /var/www/html/lab-40/test/invoice_reminder.php');
var_dump($pid);
var_dump(is_pid_running($pid));
var_dump(kill_pid($pid));