Running multiple threads example php

threads.php

<?php


$pids = array();

for ($i = 0; $i < 10; ++$i) {
    $pid = pcntl_fork();

    if ($pid != 0) {
        $pids[]=$pid;
    }else{
        $worker = function() use($i) {
            while (true) { echo "waiting $i\r\n"; sleep(1); }
        };
        $worker();
        exit();
    }
}

foreach ($pids as $pid) {
    pcntl_waitpid($pid, $status);
    usleep(50000);
}

/* Expected OUTPUT
waiting 0
waiting 1
waiting 2
waiting 3
waiting 4
waiting 5
waiting 6
waiting 7
waiting 8
waiting 9
*/