Configuration.php

<?php

namespace SimpleSAML;

use SimpleSAML\Utils\System;

/**
 * Configuration of SimpleSAMLphp
 *
 * @author Andreas Aakre Solberg, UNINETT AS. <andreas.solberg@uninett.no>
 * @package SimpleSAMLphp
 */
class Configuration implements Utils\ClearableState
{
    /**
     * A default value which means that the given option is required.
     *
     * @var string
     */
    const REQUIRED_OPTION = '___REQUIRED_OPTION___';


    /**
     * Associative array with mappings from instance-names to configuration objects.
     *
     * @var array
     */
    private static $instance = [];


    /**
     * Configuration directories.
     *
     * This associative array contains the mappings from configuration sets to
     * configuration directories.
     *
     * @var array
     */
    private static $configDirs = [];


    /**
     * Cache of loaded configuration files.
     *
     * The index in the array is the full path to the file.
     *
     * @var array
     */
    private static $loadedConfigs = [];


    /**
     * The configuration array.
     *
     * @var array
     */
    private $configuration;


    /**
     * The location which will be given when an error occurs.
     *
     * @var string
     */
    private $location;


    /**
     * The file this configuration was loaded from.
     *