title: Using Gravity Forms "gform_after_submission" filter hook
body: <p>I want to update the post and edit the value of an existing field with a sequence number after the entry has been created at <code>gform_after_submission</code> hook.</p>
  
  <p>The requirement is to update a single field value in the same post and then update the post. I I found <a href="http://www.gravityhelp.com/documentation/page/Gform_after_submission" rel="nofollow">this documentation</a> but not that helpful.</p>
  
  <p>And tried the following but it's updating all the fields:</p>
  
  <pre><code>add_filter( "gform_save_field_value", "set_field_value", 10, 4 ); 
  
  function set_field_value( $value, $lead, $field, $form ){ 
      if( $form['id'] != 1 || $field['id'] != 19 ) 
          return; 
  
      $value = "xxx"; 
      return $value; 
  }
  </code></pre>