NAME
	code_value - code a value into a string.

SYNTAX
	string code_value(mixed v);

DESCRIPTION
	Return a string that contains a readable and decodable representation
	of the value v.

BUGS
	Functionpointers cannot be decode, and objects can only be decoded
	if their hash_name is the same.

SEE ALSO
	decode_value, save_object, restore_object