(PECL pthreads >= 2.0.0)
Thread::getThreadId — Identification
public Thread::getThreadId ( ) : int
Will return the identity of the referenced Thread
This function has no parameters.
A numeric identity
Example #1 Return the identity of the referenced Thread
<?php
class My extends Thread {
    public function run() {
        printf("%s is Thread #%lu\n", __CLASS__, $this->getThreadId());
    }
}
$my = new My();
$my->start();
?> The above example will output:
My is Thread #123456778899
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    https://www.php.net/manual/en/thread.getthreadid.php