Supported Versions: PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8
Forks the currently running process
<?php pcntl_fork(): int
<?php     protected function forkSendSignal($signal)

    {

        $currentPid = posix_getpid();

        $childPid = pcntl_fork();

        if ($childPid == -1) {

            $this->fail("Failed to fork child process!");

        } else if ($childPid === 0) {