array('label'=>'Identifiant','type'=>'key'),
        'key' => array('label'=>'Clée','type'=>'longstring'),
        'value' => array('label'=>'Valeur','type'=>'longstring')
    );
    /**
     * Get all configurations from database OR session if it was yet loaded
     * This function is called at start of program and global var '$conf' is filled with response, so use global $conf instead of call this function.
     * #### Example
     * ```php
     * $confs = Configuration::getAll();
     * var_dump($confs);
     * ```.
     * @return array Array of configurations
     */
    public function getAll() {
        if (!isset($_SESSION['configuration'])) {
            $configurationManager = new self();
            $configs = $configurationManager->loadAll();
            $this->confTab = array();
            foreach ($configs as $config)
                $this->confTab[$config->key] = decrypt($config->value);
            $_SESSION['configuration'] = serialize($this->confTab);
        } else {
            $this->confTab = unserialize($_SESSION['configuration']);
        }
    }
    //Défini / récupère un set de configurations générique
    public static function setting($name,$settings=null){
        if(!isset($settings)) return isset($GLOBALS['setting'][$name]) ? $GLOBALS['setting'][$name] : array();
        $GLOBALS['setting'][$name] = $settings;
    }
    //Met en page (tableau html) un set de configuration générique
    public static function html($name){
        global $conf;
        $options = isset($GLOBALS['setting'][$name]) ? $GLOBALS['setting'][$name] : array(); ?>
        
        get('myConfigKey'); // print myConfigKey value
     * ```.
     * @param string configuration key
     * @param string configuration namespace (default is 'conf')
     *
     * @return string valeur de la configuration
     */
    public function get($key) {
        return isset($this->confTab[$key]) ? htmlspecialchars_decode($this->confTab[$key]) : '';
    }
    /**
     * Update or insert configuration value in database with specified key
     * #### Example
     * ```php
     * global $conf; // global var, contain configurations
     * echo $conf->put('myNewConfigKey','hello!'); //create configuration myNewConfigKey with value 'hello!'
     * echo $conf->put('myNewConfigKey','hello 2!'); //update configuration myNewConfigKey with value 'hello2!'
     * ```.
     *
     * @param string configuration key
     * @param string configuration value
     * @param string configuration namespace (default is 'conf')
     */
    public function put($key, $value) {
        $secured_value = encrypt($value);
        $configurationManager = new self();
        if(isset($this->confTab[$key])) {
            $configurationManager->change(array('value' => $secured_value), array('key' => $key));
        } else {
            $configurationManager->add($key, $secured_value);
        }
        $this->confTab[$key] = $value;
        unset($_SESSION['configuration']);
    }
    /**
     * Remove configuration value in database with specified key
     * #### Example
     * ```php
     * global $conf; // global var, contain configurations
     * echo $conf->remove('myNewConfigKey'); //delete myNewConfigKey from 'conf' default namespace
     * echo $conf->remove('myNewConfigKey','myCustomPluginConfig'); //delete myNewConfigKey from 'myCustomPluginConfig' namespace
     * ```.
     *
     * @param string configuration key
     * @param string configuration namespace (default is 'conf')
     */
    public function add($key, $value) {
        $config = new self();
        $config->key = $key;
        $config->value = $value;
        $config->save();
        $this->confTab[$key] = $value;
        unset($_SESSION['configuration']);
    }
}