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php4对session操纵提供以下接口：
session_start — initialize session data
session_destroy — destroys all data registered to a session
session_name — get and/or set the current session name
session_module_name — get and/or set the current session module
session_save_path — get and/or set the current session save path
session_id — get and/or set the current session id
session_register — register a variable with the current session
session_unregister — unregister a variable from the current session
session_is_registered — find out if a variable is registered in a session
session_decode — decodes session data from a string
session_encode — encodes the current session data as a string
