session_id(3) [php man page]

SESSION_ID(3)								 1							     SESSION_ID(3)

session_id - Get and/or set the current session id

SYNOPSIS

       string session_id ([string  $id])

DESCRIPTION

       session_id(3) 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.

PARAMETERS

	      o $id
		- If $id is specified, it will replace the current session id. session_id(3) needs to be called before session_start(3)  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(3) will always send	a  new	cookie	when  session_start(3)	is
		     called, regardless if the current session id is identical to the one being set.

RETURN VALUES

       session_id(3)  returns  the session id for the current session or the empty string ( "") if there is no current session (no current session
       id exists).

SEE ALSO

       session_regenerate_id(3), session_start(3), session_set_save_handler(3), session.save_handler.

PHP Documentation Group 													     SESSION_ID(3)

SESSIONHANDLERINTERFACE.READ(3) 					 1					   SESSIONHANDLERINTERFACE.READ(3)

SessionHandlerInterface::read - Read session data

SYNOPSIS

       abstractpublic string SessionHandlerInterface::read (string  $session_id)

DESCRIPTION

	Reads  the  session data from the session storage, and returns the results. Called right after the session starts or when session_start(3)
       is called. Please note that before this method is called SessionHandlerInterface.open(3) is invoked.

	This method is called by PHP itself when the session is started. This method should retrieve the session data from storage by the  session
       ID provided. The string returned by this method must be in the same serialized format as when originally passed to the SessionHandlerInter-
       face.write(3) If the record was not found, return an empty string.

	The data returned by this method will be decoded internally by PHP using the unserialization method  specified	in  session.serialize_han-
       dler. The resultig data will be used to populate the $_SESSION superglobal.

	Note that the serialization scheme is not the same as unserialize(3) and can be accessed by session_decode(3).

PARAMETERS

	      o $session_id
		- The session id.

RETURN VALUES

	Returns an encoded string of the read data. If nothing was read, it must return an empty string. Note this value is returned internally to
       PHP for processing.

SEE ALSO

	The session.serialize_handler configuration directive. .

PHP Documentation Group 											   SESSIONHANDLERINTERFACE.READ(3)