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<?php
/**
* Handles retrieving of the configuration options.
* You can add configuration files to /application/config folder
* and later access them via the get() method.
* @package Core
*/
class Config {
/**
* Array of configuration files and values loaded from them
* @var array
* @access protected
* @static
*/
protected static $groups = array();
/**
* Loads a group configuration file it has not been loaded before
* and returns its options.
*
* @param string $name Name of the configuration group to load
* @return array Array of options for this group
* @access public
* @throws Exception If a configuration file for this group does not exist
* @static
*/
public static function get_group($name) {
if (!isset(Config::$groups[$name])) {
$file = Misc::find_file('config', $name);
if (!$file)
throw new Exception("Configuration file {$name}.php was not found.");
Config::load_group($name,$file);
}
return Config::$groups[$name]['options'];
}
/**
* Loads group from file
*
* @param string $name Name to assign the loaded group
* @param string $file File to load
* @access public
* @static
*/
public static function load_group($name, $file) {
Config::$groups[$name] = array(
'file' => $file,
'options' => include($file)
);
}
/**
* Retrieves a configuration value. You can use a dot notation
* to access properties in group arrays. The first part of the key
* specifies the configuration file from which options should be loaded from
* <code>
* //Loads ['default']['user'] option
* //from database.php configuration file
* Config::get('database.default.user');
* </code>
*
* @param string $key Configuration key to retrieve.
* @param string $default Default value to return if the key is not found.
* @return mixed Configuration value
* @access public
* @throws Exception If default value is not specified and the key is not found
* @static
*/
public static function get() {
$p = func_get_args();
$keys = explode('.', $p[0]);
$group_name = array_shift($keys);
$group = Config::get_group($group_name);
for ($i = 0; $i < count($keys); $i++) {
if ($i == count($keys) - 1) {
if (isset($group[$keys[$i]]))
return $group[$keys[$i]];
break;
}
$group = Misc::arr($group, $keys[$i], null);
if (!is_array($group))
break;
}
if (isset($p[1]))
return $p[1];
throw new Exception("Configuration not set for {$p[0]}.");
}
/**
* Sets a configuration option.
*
* @param string $key Configuration key to set
* @param string $value Value to set for this option
* @access public
* @static
*/
public static function set($key,$value){
$keys = explode('.', $key);
$group_name = array_shift($keys);
$group = Config::get_group($group_name);
$subgroup = & $group;
foreach($keys as $i => $key) {
if ($i == count($keys) - 1) {
$subgroup[$key] = $value;
} else {
if(!isset($subgroup[$key])||!is_array($subgroup[$key]))
$subgroup[$key]=array();
$subgroup = & $subgroup[$key];
}
}
Config::$groups[$group_name]['options'] = $group;
}
/**
* Writes a configuration group back to the file it was loaded from
*
* @param string $group Name of the group to write
* @access public
* @static
*/
public static function write($group){
Config::get_group($group);
$group=Config::$groups[$group];
file_put_contents($group['file'],"<?php\r\nreturn ".var_export($group['options'],true).";");
}
}
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