代码:

<?phpfor ($i = 1; $i <= 5; $i++) { $pid = pcntl_fork(); if (!$pid) { print "In child $i\n"; exit($i); }}while (pcntl_waitpid(0, $status) != -1) { $status = pcntl_wexitstatus($status); echo "Child $status completed\n";}输出:

In child 4Child 4 completedIn child 1Child 1 completedIn child 2Child 2 completedIn child 3Child 3 completedIn child 5Child 5 completed