(PHP 4 >= 4.0.7, PHP 5)
pcntl_wexitstatus — Returns the return code of a terminated child
Returns the return code of a terminated child. This function is only useful if pcntl_wifexited() returned TRUE.
status 参数是提供给成功调用的 pcntl_waitpid() 函数的状态参数。
Returns the return code, as an integer.