这段代码可以在管理页面，自定义一个错误信息，把他放在主题的functions.PHP中就可以实现该功能
add_action( 'admin_notices','custom_error_notice' );
function custom_error_notice(){
global $current_screen;
if ( $current_screen->parent_base == 'themes' )
echo '<div class="error"><p>Warning - If you modify template files this could cause problems with your website.</p></div>';
}
function custom_error_notice(){
global $current_screen;
if ( $current_screen->parent_base == 'themes' )
echo '<div class="error"><p>Warning - If you modify template files this could cause problems with your website.</p></div>';
}