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session_id

  • 28

session_id

(PHP 4, PHP 5)

session_idGet and/or set the current session id

说明

string session_id ([ string $id ] )

session_id() is used to get or set the session id for the current session.

The constant SID can also be used to retrieve the current name and session id as a string suitable for adding to URLs. See also Session handling.

参数

id

If id is specified, it will replace the current session id. session_id() needs to be called before session_start() for that purpose. Depending on the session handler, not all characters are allowed within the session id. For example, the file session handler only allows characters in the range a-z A-Z 0-9 , (comma) and - (minus)!

Note: When using session cookies, specifying an id for session_id() will always send a new cookie when session_start() is called, regardless if the current session id is identical to the one being set.

返回值

session_id() returns the session id for the current session or the empty string ("") if there is no current session (no current session id exists).

更新日志

版本 说明
5.0.0 The , (comma) and - (minus) characters are allowed in the file session handler.

参见


  • session_cache_expire
  • session_cache_limiter
  • session_commit
  • session_decode
  • session_destroy
  • session_encode
  • session_get_cookie_params
  • session_id
  • session_is_registered
  • session_module_name
  • session_name
  • session_regenerate_id
  • session_register
  • session_save_path
  • session_set_cookie_params
  • session_set_save_handler
  • session_start
  • session_status
  • session_unregister
  • session_unset
  • session_write_close
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