Add custom error messages to admin panel

Adding this snippet to the functions.php of your wordpress theme will display a custom error message displayed within the “theme” admin screen. Change the parent_base to edit, tools etc, to display message on another admin screen.

 

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>';
}

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