Reference

Datatypes: Array (a), Integer (i), String (s)

Global methods
	get
		Gets PHP value
	is_a
		Check if it is array
	is_i
		Check if it is integer
	is_s
		Check if it is string	
	length
		Length of array, string
	methods
		List available methods
	to_a
		Converts to array
	to_i
		Converts to integer
	to_s
		Converts to string

Array methods
    item ( index )
		Get item by index from the array
	add ( item )
		Add item at end of array
	add_last
		Alias of "add"
	append ( array_of_items )
		Concat array_of_items at end of array
	prepend
		Concat array_of_items at beginning of array
	remove ( & deleted_item )
		Remove item at end of array
	remove_first ( & deleted_item )
		Remove item at beginning of array
	remove_last ( & deleted_item )
		Alias of "remove"
Integer methods

String methods