SQL Query in PHP for use nested navigation menu

Menu Needs SQL Need. I need the most efficient SQL query I can find that returns a dataset being used to build a website navigation menu. This is a typical navigation menu in most respect however it must allow for unlimited nesting. So there are two main fields. The item_id and item_parent. Every item has an id and every item has a parent - except the root heading which is assigned an item_parent of 0. A php sql query must be written in such a way that it recurses through every item, notes its parent item and builds a hierarchal tree structure from hierarchal structure noted. For instance Heading 0 ......Item 0 ......Item 1 ............Item 0 ..................Item 0 ..................Item 1 ............Item 1 ............Item 2 ......Item 2 Heading 1 ......Item 0 ......Item 1 ......Item 2 Heading 3 ......Item 0 ......Item 1 ......Item 2 ............Item 0 ......Item 3 I have attached a mysql sql file which you can import for use. Please incorporate the item_title which would serve as the Item Text and also href the item_link.