class.shibServerData.php

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<?php
class shibServerData extends shibConfig
{
    protected static $server_cache;

    protected function __construct(array $data)
    {
        $shib_config = shibConfig::getInstance();
        foreach (array_keys(get_class_vars(shibConfig::class)) as $field) {
            $str = $shib_config->getValueByKey($field);
            if ($str !== null) {
                $this->{$field} = $data[$str] ?? '';
            }
        }
    }

    public static function getInstance() : \shibConfig
    {
        if (!isset(self::$server_cache)) {
            self::$server_cache = new self($_SERVER);
        }

        return self::$server_cache;
    }
}