spl_autoload_register(function (string $class_name): void {
    $conf = Config::get();
    $classDir = $conf['INCLUDE_DIR'] . '/classes/';

    // Convert underscore-namespaced class names to directory paths
    // e.g. "User_Member" → "classes/User/Member.php"
    $classFile = str_replace('_', '/', $class_name);
    $fullPath   = $classDir . $classFile . '.php';

    if (file_exists($fullPath)) {
        require_once $fullPath;
        return;
    }

    // Fall back to legacy include files only when the class lives in one of them.
    // Map known class names to the inc file that defines them so we don't
    // blindly load every inc on every miss.
    $incDir = $conf['INCLUDE_DIR'];
    $incMap = [
        'Page'     => "$incDir/page.inc.php",
        'Image'    => "$incDir/image.inc.php",
        'Member'   => "$incDir/user.inc.php",   // ← fixes your immediate error
        'User'     => "$incDir/user.inc.php",
        'Sport'    => "$incDir/sport.inc.php",
        'PM'       => "$incDir/pm.inc.php",
        'Event'    => "$incDir/event.inc.php",
        'Location' => "$incDir/location.inc.php",
        'Comment'  => "$incDir/comment.inc.php",
    ];

    if (isset($incMap[$class_name])) {
        require_once $incMap[$class_name];
        return;
    }

    // PHPMailer (legacy class names)
    $mailerMap = [
        'PHPMailer' => "$incDir/phpmailer/class.phpmailer.php",
        'SMTP'      => "$incDir/phpmailer/class.smtp.php",
    ];

    if (isset($mailerMap[$class_name])) {
        require_once $mailerMap[$class_name];
        return;
    }

    // Nothing found — let PHP raise its own "class not found" error,
    // or throw explicitly if you prefer the RuntimeException style.
    throw new \RuntimeException(
        "Class '$class_name' could not be loaded. "
        . "Checked $fullPath and legacy inc files. "
        . "INCLUDE_DIR={$conf['INCLUDE_DIR']}"
    );
});<br />
<b>Fatal error</b>:  Class 'Page_Location' not found in <b>/var/www/hosts/sportkin/public_html/location/index.php</b> on line <b>5</b><br />