Advanced INI file: Read and parse INI files with multiple levels

This class can read and parse INI files with N levels.

It can read and parse a given INI file and build an associative array with entries for each section and each variable value.

Sections with names with colons : are returned as multiple levels of the associative array, for instance [ abc:def ] will be returned as

$var['abc']['def'] = values;

Variable names such as a.b.c and a:b:c will be expanded into sub-levels, such as:

['a']['b']['c'] = value;

It also supports variable substitution using values of certain settings to define other settings such as:

root = "/mnt/some/path"
logs.access = "{root}/access_log"

It has now been updated with the following extensions:

#include <filename> Includes the file <filename>
#define <name> <value> Defines the constant <name> to be <value>
#iniset <name> <value> Sets the ini parameter <name> to be <value>

Includes can be N-level.