Execute a file in parallel / multithreading in PHP - php

Question

I have a cron file cron/cron1.php. i have set up this for cron running 1 minute.
so for next process it will take 1 minute to execute.
now i want to run this file parallel three times in minute. this file takes execution time more than 2 min.
can i run this file parallel in a single file like this
file1.php
<?php
include("cron/cron1.php"); // run seperately
sleep(5);
include("cron/cron1.php"); // run seperately
sleep(5);
include("cron/cron1.php"); // run seperately
?>
in above file cron1.php will execute 5 seconds difference but when above one is completed its process. as i told you each cron1.php will takes more than 2 minutes to complete. so i couldn't achieve it.
is there any process or multithreading or approch so that i can run each cron1.php every 5 seconds delay. then i will set the file1.php as a cron job.

Answer 1

PHP DOES SUPPORT MULTI-THREADING
http://php.net/pthreads
Here is a multi-threaded example of the kind of logic you require:
<?php
define("SECOND", 1000000);
define("LOG", Mutex::create());
/*
* Log safely to stdout
* #param string message the format string for log
* #param ... args the arguments for sprintf
* #return void
*/
function slog($message, $args = []) {
$args = func_get_args();
if ((count($args) > 0) &&
($message = array_shift($args))) {
$time = microtime(true);
Mutex::lock(LOG);
echo vsprintf(
"{$time}: {$message}\n", $args);
Mutex::unlock(LOG);
}
}
class MyTask extends Thread {
public $id;
public $done;
public function __construct($id) {
$this->id = $id;
$this->done = false;
}
public function run() {
slog("%s#%d entered ...", __CLASS__, $this->id);
/* don't use sleep in threads */
$this->synchronized(function(){
/* simulate some work */
$this->wait(10 * SECOND);
});
slog("%s#%d leaving ...", __CLASS__, $this->id);
$this->done = true;
}
}
$threads = [];
function get_next_id(&$threads) {
foreach ($threads as $id => $thread) {
if ($thread->done) {
return $id;
}
}
return count($threads);
}
do {
slog("Main spawning ...");
$id = get_next_id($threads);
$threads[$id] = new MyTask($id);
$threads[$id]->start();
slog("Main sleeping ...");
usleep(5 * SECOND);
} while (1);
?>
This will spawn a new thread every 5 seconds, the threads take 10 seconds to execute.
You should try to find ways of increasing the speed of individual tasks, perhaps by sharing some common set of data.

Answer 2

What you could do is run multiple processes at the same time, with something like this:
exec('php cron/cron1.php > /dev/null 2>&1 &');
exec('php cron/cron1.php > /dev/null 2>&1 &');
exec('php cron/cron1.php > /dev/null 2>&1 &');
Each exec call will run in the background so you can have as many as needed.