php省session的方法

php省session的方法

//session
	function session($name=null, $val = ''){
		if(!isset($_SESSION)){
			session_name('SID');
			session_start();
			if($_SESSION['token']!==$_SERVER['HTTP_USER_AGENT']){
				$_SESSION=array();
			}
		}
		if(is_string($name)){
			if (strpos($name, '.')) {
				$n = explode('.', $name);
				if ('' === $val){
					return $_SESSION[$n[0]][$n[1]];
				}else{
					$_SESSION[$n[0]][$n[1]] = $val;
				}
			} else {
				if ('' === $val){
					return $_SESSION[$name];
				}else{
					$_SESSION[$name] = $val;
				}
			}
		}
		$_SESSION['token']=$_SERVER['HTTP_USER_AGENT'];
		return $_SESSION;
	}