Script to spawn a bunch of CLI scripts in the background and restart any that fail.

spawn-restart-scripts.php

<?php

$scripts = [];
$scripts[] = 'ping google.com > google.txt';
$scripts[] = 'ping msn.com > msn.txt';

function spawn_scripts($scripts) {
  $pids = [];

  // iterate scripts, building list of indexed PIDs
  foreach ($scripts as $ix => $script) {
    $pids[$ix] = shell_exec("nohup $script > /dev/null 2>&1 & echo $!");
  }

  while (true) {
    // iterate indexed PIDs, respawning any scrip[t that's not running
    foreach ($pids as $ix => $pid) {
      $res = shell_exec("ps -p $pid");
      if (count(preg_split("/\n/", $res)) <= 2) {
        shell_exec("nohup $scripts[$ix] > /dev/null 2>&1 & echo $!");
      }
    }

    sleep(5);
    
    // check for kill file
    if( file_exists( 'killnohup' ) ) {
      $killcommand = 'ps -ef | grep nohup | awk '{print $2}' | xargs kill -9';
      shell_exec( $killcommand );
    }
  }
}