如果将其添加到函数中。php，这将按设置更新选项。

function custom_image_size() {
    // Set default values for the upload media box
    update_option(\'image_default_align\', \'center\' );
    update_option(\'image_default_size\', \'large\' );

}
add_action(\'after_setup_theme\', \'custom_image_size\');