PHP Manual: Execution

public bool Thread::start(int $options = ?)

Will start a new Thread to execute the implemented run method

options: An optional mask of inheritance constants, by default PTHREADS_INHERIT_ALL

Returns true on success or false on failure.

Example #1 Starting Threads

<?php
class My extends Thread {
    public function run() {
        /** ... **/
    }
}
$my = new My();
var_dump($my->start());
?>

The above example will output:

bool(true)