This is a PHP script to generate a MySQL INSERT statement to store hierarchical data using the nested set model (as described here:
http://ftp.ntu.edu.tw/MySQL/tech-resources/articles/hierarchical-data.html).

The input file should be in the format of a tab-indented list, as follows:

Food
	Fruit
		Green
			Apples
			Grapes
		Orange
			Oranges
		Red
			Cherries
			Lychees
			Tomatoes
	Vegetables
		Green
			Courgettes
			Cucumbers
		Orange
			Carrots
		Red
			Bell peppers
			
The output will be in the form of a standard SQL multiple INSERT statement, as follows:

INSERT INTO `table_name` (parent, title, lft, rgt) VALUES (('','Food',1,38), ('Food','Fruit',2,21), ('Fruit','Green',3,8), ('Green','Apples',4,5), ('Green','Grapes',6,7), ('Fruit','Orange',9,12), ('Orange','Oranges',10,11), ('Fruit','Red',13,20), ('Red','Cherries',14,15), ('Red','Lychees',16,17), ('Red','Tomatoes',18,19), ('Food','Vegetables',22,37), ('Vegetables','Green',23,28), ('Green','Courgettes',24,25), ('Green','Cucumbers',26,27), ('Vegetables','Orange',29,32), ('Orange','Carrots',30,31), ('Vegetables','Red',33,36), ('Red','Bell peppers',34,35)