php - WordPress doesn't save my custom setting in permalink section -

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i have created many custom settings in wordpress using settings api, reason having trouble 1 in particular.

i want include custom url shortener using wordpress's shortlink feature, added custom setting store url shortener's domain name. allows customizable.

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 reason, doesn't save value. get_option('shortlink_domain') function returns false.

wordpress permalink settings provide settings sections , fields doesn't save values custom fields same others page media, reading etc.

i think need way 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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