PHP 的 session_encode() 和 session_decode() 函数

//boolean session_encode()
session_register ( 'bgcolor' );
session_register ( 'fontcolor' );

$id = session_id ( $usr_id );

$bgcolor = "white";
$fontcolor = "blue";

$usr_data = session_encode ();

print $usr_data;
?>

session_start();
$_SESSION = array();
session_decode( "products|a:2:{i:0;s:8:\"Hal 2000\";i:1;s:6:\"Tardis\";}" );
foreach ( $_SESSION['products'] as $p ) {
  print "$p\n";
}
?>