session_name
(PHP 4, PHP 5)
session_name — Get and/or set the current session name
说明
string session_name
([ string $name
] )
session_name() returns the name of the current
session.
The session name is reset to the default value stored in
session.name at request startup time. Thus, you need to
call session_name() for every request (and before
session_start() or session_register()
are called).
参数
-
name
-
The session name references the session id in cookies and URLs. It
should contain only alphanumeric characters; it should be short and
descriptive (i.e. for users with enabled cookie warnings).
If name
is specified, the name of the current
session is changed to its value.
Warning
The session name can't consist of digits only, at least one letter
must be present. Otherwise a new session id is generated every time.
返回值
Returns the name of the current session.
范例
Example#1 session_name() example
<?php
/* set the session name to WebsiteID */
$previous_name = session_name("WebsiteID");
echo "The previous session name was $previous_name<br />";
?>