session_register() accepts a variable number of arguments, any of which can be either a string holding the name of a variable or an array consisting of variable names or other arrays. For each name, session_register() registers the global variable with that name in the current session.
You can also create a session variable by simply setting the
appropriate member of the
$HTTP_SESSION_VARS (PHP < 4.1.0) array.
// Use of session_register() is deprecated
$barney = "A big purple dinosaur.";
// Use of $_SESSION is preferred, as of PHP 4.1.0
$_SESSION["zim"] = "An invader from another planet.";
// The old way was to use $HTTP_SESSION_VARS
$HTTP_SESSION_VARS["spongebob"] = "He's got square pants.";
If session_start() was not called before this function
is called, an implicit call to session_start() with no
parameters will be made.
$_SESSION does not mimic
this behavior and requires session_start() before use.
A string holding the name of a variable or an array consisting of variable names or other arrays.
If you want your script to work regardless of register_globals, you need to
instead use the $_SESSION array as
$_SESSION entries are automatically registered. If
your script uses session_register(), it will not work
in environments where the PHP directive register_globals is disabled.
Since PHP 4.2.0, the default value for the PHP directive register_globals is off, and it is completely removed as of PHP 6.0.0. The PHP community encourages all to not rely on this directive but instead use other means, such as the superglobals.
This registers a global variable. If you want to
register a session variable from within a function, you need to make sure
to make it global using the global
keyword or the
$GLOBALS array, or use the special
session arrays as noted below.
It is currently impossible to register resource variables in a session.
For example, you cannot create a connection to a database and store the
connection id as a session variable and expect the connection to still be
valid the next time the session is restored. PHP functions that return a
resource are identified by having a return type of
resource in their function definition. A list of
functions that return resources are available in the resource types appendix.
for PHP 4.0.6 or less) is used, assign values to
$_SESSION. For example: $_SESSION['var'] = 'ABC';