title: Return array value
body: <p>I've got a bit of a complicated array that I'm working with and I'm not sure how to retrieve one of the values in the array. The array structure is as below and I'm trying to get the 'value'.</p>
  <pre><code>array ( 
    0 =&gt; Drupal\search_api\Query\Condition::__set_state(
      array( 
        'field' =&gt; 'title', 
        'value' =&gt; 'hello', 
        'operator' =&gt; 'CONTAINS', 
      )
    ), 
    )
  </code></pre>
  <p>I tried using $array[0]['value'] but it returns NULL.</p>
  <p>Any ideas on how to go about this one?</p>