/**
* WordPress 添加额外选项字段到常规设置页面
* http://www.wpdaxue.com/add-field-to-general-settings-page.html
*/
$new_general_setting = new new_general_setting();
class new_general_setting {
  function new_general_setting( ) {
    add_filter( ‘admin_init‘ , array( &$this , ‘register_fields‘ ) );
  }
  function register_fields() {
    register_setting( ‘general‘, ‘favorite_color‘, ‘esc_attr‘ );
    add_settings_field(‘fav_color‘, ‘<label for="favorite_color">‘.__(‘最喜欢的颜色‘ ).‘</label>‘ , array(&$this, ‘fields_html‘) , ‘general‘ );
  }
  function fields_html() {
    $value = get_option( ‘favorite_color‘, ‘‘ );
    echo ‘<input type="text" id="favorite_color" name="favorite_color" value="http://www.mamicode.com/‘ . $value . ‘" />‘;
  }
}