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(PHP 5 >= 5.4.0)
SessionHandlerInterface::destroy — Destroy a session
$session_id 
   )
   Destroys a session. Called by  session_regenerate_id()  (with $destroy =  TRUE ),
    session_destroy()  and when  session_decode()  fails.
  
session_id The session ID being destroyed.
会话存储的返回值(通常成功返回 0,失败返回 1)。