(PHP 4 >= 4.0.7, PHP 5)
pcntl_wifexited — Checks if status code represents a normal exit
Checks whether the child status code represents a normal exit.
status 參數是提供給成功呼叫的 pcntl_waitpid() 函式的狀態參數。
Returns TRUE if the child status code represents a normal exit, FALSE otherwise.