php实现多进程

1. 代码：

   <?php
   for ($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";
   }

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2. 输出：

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

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