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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. If the group doesn't exist creates an empty one
*
* @param string $name Name of the configuration group to load
* @return array Array of options for this group
* @access public
* @static
*/
public static function get_group($name)
{
if (!isset(static::$groups[$name]))
{
$file = Misc::find_file('config', $name);
if (!$file)
static::$groups[$name] = array(
'file' => APPDIR.'config/'.$name.'.php',
'options' => array()
);
else
static::load_group($name, $file);
}
return static::$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, $file)
{
static::$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);
$group = static::get_group($group_name);
if (empty($keys))
return $group;
$total = count($keys);
foreach ($keys as $i => $key)
{
if (isset($group[$key]))
{
if ($i == $total - 1)
return $group[$key];
$group = &$group[$key];
}else
{
if (array_key_exists(1, $p))
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);
$group = static::get_group($group_name);
$subgroup = &$group;
$last_key = count($keys) - 1;
foreach ($keys as $i => $key)
{
if ($i == $last_key)
{
$subgroup[$key] = $value;
}
else
{
if (!isset($subgroup[$key]) || !is_array($subgroup[$key]))
$subgroup[$key] = array();
$subgroup = & $subgroup[$key];
}
}
static::$groups[$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)
{
static::get_group($group);
$group = static::$groups[$group];
file_put_contents($group['file'], "<?php\r\nreturn ".var_export($group['options'], true).";");
}
}
|
