<?=

$form->field($model, 'eap_methods')->dropDownList(['passthrough' => 'passthrough',
    'eap-tls' => 'eap-tls',]);
?>
<?=

$form->field($model, 'tls_mode')->dropDownList(['no-certificates' => 'no-certificates',
    'verify-certificate' => 'verify-certificate',
    'dont-verify-certificate' => 'dont-verify-certificate',]);
$keys['none'] = 'none';
?>
<?= $form->field($model, 'tls_certificate')->dropDownList($keys); ?>