This script checks if asterisk is running by a specific user and has not reset since last run.

asteriskcheck.php

<?php
/**
 * Copyright 2023 James Finstrom
 * File: asteriskcheck
 *
 * Description: This PHP file contains the functionality for checking if asterisk is 
 * running by a specific user and has not reset since last run.
 *
 * Author: James Finstrom
 *
 * Contact: github@g3p0.xyz
 *
 * Date: 11/08/2023
 *
 * @license BSD-3-Clause https://opensource.org/license/bsd-3-clause/
 * 
 */
/* Configuration */
$emailAddress = "your_email@example.com";
$fromAddress = "from@example.com";
$asteriskUser = "asterisk";
$commandToCheck = "/usr/sbin/asterisk -f -U asterisk -G asterisk -vvvg -c";
$logFile = "last_run_status.txt";

function checkProcess() {
    $psOutput = shell_exec("ps aux");
    $psLines = explode("\n", $psOutput);

    foreach ($psLines as $line) {
        if (strpos($line, $asteriskUser) === 0 && strpos($line, $commandToCheck) !== false) {
            $timeInfo = preg_split('/\s+/', $line);
            if (count($timeInfo) >= 9) {
                return $timeInfo[8];
            }
        }
    }

    return null;
}

function main() {
    if (file_exists($logFile)) {
        $lastRunStatus = trim(file_get_contents($logFile));
    } else {
        $lastRunStatus = "0";
    }

    $currentStatus = checkProcess();

    if ($currentStatus) {
        if ($lastRunStatus !== "1") {
            /* Send an email since the process has started or changed */
            $subject = "Asterisk Process Started or Changed";
            $message = "Asterisk process has started or changed.";
            $headers = "From: " . $fromAddress;

            mail($emailAddress, $subject, $message, $headers);
        }
    } else {
        if ($lastRunStatus !== "0") {
            /* Send an email since the process has terminated or reset */
            $subject = "Asterisk Process Terminated or Reset";
            $message = "Asterisk process has terminated or reset.";
            $headers = "From: " . $fromAddress;

            mail($emailAddress, $subject, $message, $headers);
        }
    }

    /* Update the last run status in the log file */
    file_put_contents($logFile, $currentStatus ? "1" : "0");
}

main();