A helper to work with sessions in php

Session.class.php

<?php
	class Session{
		public static function add( $name, $value ){
			$_SESSION[ $name ] = $value;
	    	}
	        
		public static function del( $name ){
	        	unset( $_SESSION[ $name ] );
	    	}
	        
	    	public static function get( $name ){
	        	return $_SESSION[ $name ];
	    	}
	        
	    	public static function exists( $name ){
	    	    	return isset( $_SESSION[ $name ] );
	    	}
	        
	    	public static function startAll(){
	        	session_start();
	    	}
	        
	    	public static function destroyAll(){
	        	session_destroy();
	    	}
	}
?>