WordPress doesn’t save my custom setting in permalink section

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I have created many custom settings in WordPress using their Settings API, but for some reason I am having trouble with one in particular.

I want to include a custom URL shortener using WordPress’s shortlink feature, so I added a custom setting to store the URL shortener’s domain name. This allows it to be customizable.

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function urb_admin_init_shortlink_domain()
{
  $option_group = 'permalink';
  $option_name = 'shortlink_domain';
  $sanitize_callback = null;

  register_setting( $option_group, $option_name, $sanitize_callback );

  $id = 'shortlink_domain';
  $title = 'Shortlink Domain';
  $callback = 'urb_shortlink_domain';
  $page = 'permalink';
  $section = 'optional';
  $args = null;

  add_settings_field( $id, $title, $callback, $page, $section, $args );
}

function urb_shortlink_domain()
{
  $option = 'shortlink_domain';
  echo '<input type="text" name="' . $option . '" id="' . $option . '" value="' . get_option( $option ) . '" class="regular-text ltr" />';
}

add_action( 'admin_init', 'urb_admin_init_shortlink_domain' );

For some reason, it doesn’t save the value. The get_option('shortlink_domain') function returns false.

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1 comment

  1. WordPress permalink settings only provide settings sections and fields but it doesn’t save values custom fields same as others page like Media, Reading etc.

    I think you need to another way to save custom fields values on permalink page.

    Below sample code of save setting on permalink page.

    add_action( 'admin_init', 'save_your_permalink_settings' );

function save_your_permalink_settings(){

  if( isset($_POST['permalink_structure']) && isset( $_POST['shortlink_domain'] ) ){

    $short_domain = wp_unslash( $_POST['shortlink_domain'] );
    update_option( 'shortlink_domain',  $short_domain );

  } 
}

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