How to get text from radio option value
Assuming Drupal 8 (since you didn't give a version), there are two parts to this.

Imagine this element in the form:

$form['some_field'] = [
  '#type' =&gt; 'radios',
  '#options' =&gt; [
    'option1' =&gt; $this-&gt;t('Option 1'),
    'option2' =&gt; $this-&gt;t('Option 2'),
  ],
];


The submitted value can be retrieved from $form_state in your submit handler:

$radio_value = $form_state-&gt;getValue('some_field');


You can then use the value to get the text of the radio, from the $form element:

$radio_text = $form['some_field']['#options'][$radio_value];