Alternative way to achieve this kind of validation

Hello,

don't kill me please. I tried the Laravel "validation" style but I'm unable to get the same result for the following (dirty) code.

public function update(Request $request)
    {

        if (empty($request->current_password)) {
            return back()->withInput()
                ->with('error', 'lang.profile.settings.preferences.password.current_password.error.required')
                ->with('hasLinkBack', true);
        }

        if (empty($request->new_password)) {
            return back()->withInput()
                ->with('error', 'lang.profile.settings.preferences.password.new_password.error.required')
                ->with('hasLinkBack', true);
        }

        if (strlen($request->new_password) < 8) {
            return back()->withInput()
                ->with('error', 'lang.profile.settings.preferences.password.new_password.error.min')
                ->with('hasLinkBack', true);
        }

        if (empty($request->new_password_verify)) {
            return back()->withInput()
                ->with('error', 'lang.profile.settings.preferences.password.new_password_verify.error.required')
                ->with('hasLinkBack', true);
        }

        if ($request->new_password !== $request->new_password_verify) {
            return back()->withInput()
                ->with('error', 'lang.profile.settings.preferences.password.new_password_verify.error.different')
                ->with('hasLinkBack', true);
        }

        // Check current password
        if (!Hash::check($request->current_password, auth('foo')->user()->password)) {
            return back()->withInput()
                ->with('error', 'lang.profile.settings.preferences.password.current_password.error.incorrect')
                ->with('hasLinkBack', true);
        }

        // Update password
        auth('foo')->user()->update(['password' => Hash::make($request->new_password)]);

        return redirect()
            ->route('my.profile.settings.preferences.password.edit')
            ->with('success', 'lang.profile.settings.preferences.password.updated_successfully');
    }

Basically I want to flash one error at time. Could you please suggest a cleaner approach?

Thanks Simon