$cmdString = "remote/table4/run/download;
 {database/table1/run;
 database/table2/run;
 database/table3/run};
 remote/table4/run/upload;"

/*
first run is remote/table4/run/download;

then {database/table1/run;
 database/table2/run;
 database/table3/run}; all run at the same time

then last run is remote/table4/run/upload; runs
*/

 public function runParallelCmds($cmdString)
 {
 set_time_limit(900);

 try {
$parentjob = [
 'result' => true,
 'error' => '',
 'start' => date('Y-m-d H:i:s'),
 'finish' => null,
 'subjobs' => [],
 ];

$commands = array_map('trim', explode(';', $cmdString));

$results = [];

 foreach ($commands as $command) {
$pathSeperater = '/';
 if (PHP_OS_FAMILY === 'Windows') {
$pathSeperater = '\\';
 }

 // write pid file
$file = str_replace('/', '-', $command);
$path = WRITEPATH . 'proccess' . $pathSeperater . $file . '.txt';
 if (file_exists($path)) {
 @unlink($path);
 }

$results[$file] = [
 'isfinished' => false,
 'command' => $command,
 'start' => date('Y-m-d H:i:s'),
 'finish' => null,
 'path' => $path,
 'json' => '',
 ];

 if (PHP_OS_FAMILY === 'Windows') {
 pclose(popen("start /B C:\\xampp\\php\\php.exe C:\\xampp\\portal\\public\\index.php cron/{$command} 1> {$path} 2>&1 &", 'r'));
 } elseif (PHP_OS_FAMILY === 'Linux') {
 exec("php8.0 /var/www/portal/public/index.php cron/{$command} > {$path} 2>&1 &");
 }
 }

 while (true) {
 sleep(1);

 foreach ($results as $key => $result) {
 // look if pid file has results
 if (file_exists($result['path'])) {
$file = new \CodeIgniter\Files\File($result['path']);
 if ((int) $file->getSize() > 0 && $results[$key]['isfinished'] === false) {
$results[$key]['isfinished'] = true;
$results[$key]['finish'] = date('Y-m-d H:i:s');
$json = json_decode(file_get_contents($result['path']));
 if ($json === false) {
$string = substr(str_replace([' '], ' ', str_replace(["\r","\n"], ' ', file_get_contents($result['path']))), 0, 255);
$json = new stdClass();
$json->result = false;
$json->error = trim($string);
$parentjob['result'] = false;
$parentjob['error'] .= 'Error ' . $results[$key]['command'] . ';' . '<br>';
 } else {
 if ($json->result === false) { // json returned but job was in error ?
$parentjob['error'] .= 'Error ' . $results[$key]['command'] . '; ' . $json->error . '<br>';
$parentjob['result'] = false; // added?
 }
 }
$results[$key]['json'] = $json;
 }
 }
 }

$alljobsfinished = true;

 foreach ($results as $result) {
 if ($result['isfinished'] === false) {
$alljobsfinished = false;
 }
 }

 if ($alljobsfinished === true) {
$parentjob['finish'] = date('Y-m-d H:i:s');
$parentjob['subjobs'] = (array) $results;

 // if job finished then delete pid file
 foreach ($results as $result) {
 @unlink($result['path']);
 }
 // if all jobs finished then break loop
 break;
 }
 }
 if ($parentjob['result'] === true) {
 foreach ($results as $result) {
$parentjob['error'] .= 'Cmd: ' . $result['command'] . ' | ' . $result['json']->error . '<br>';
 }
 }
 } catch (Throwable $e) {
$result = false;
$error = $e->getMessage() . ' ' . basename($e->getFile()) . ' Line ' . $e->getLine();

 return ['result' => false, 'error' => $error]; // ?
 }

 return ['result' => $parentjob['result'], 'error' => $parentjob['error']];
 }