Hide error and warning in admin panel

Question

I want to hide error and warning message from admin panel. I have checked the option None in admin panel for error reporting and still it showing error and warning messages in admin panel. let me how it can removed.

Answer 1

The code suggested by indrock would remove all the messages shown by the modules, not just error messages, and warnings.

What you can do is implement THEME_preprocess_HOOK() using the following code.

function mytheme_preprocess_page(&$variables) {
  if (path_is_admin(current_path())) {
    unset($_SESSION['messages']['warning']);
    unset($_SESSION['messages']['error']);
  }
}

current_path() currently returns the value of $_GET['q']; I am using it for compatibility with Drupal 8, as for that version current_path() is not simply returning the value of $_GET['q'].
Instead of unset($_SESSION['messages'][$type]), you can use drupal_get_messages($type, TRUE). Using drupal_get_messages(), you are sure your code works even when the messages are stored in a different session variable, or a variable that is a session variable. So far, it doesn't seem necessary, as Drupal 8 uses the same session variables used from Drupal 7, for the messages.

The settings in admin/config/development/logging are for error messages caused by PHP code. They don't influence the error messages shown by modules.

Answer 2

Although it is not a good idea to hide the errors (you may want to solve it; by watching the error log, debugging etc.), there is a way you can do it.

You can do it at theme level in template_process_page() function, in your theme's template.php file. (It should be placed in your admin theme's template.php)
Code: Edited according to @Chapabu 's comments :)
Used path_is_admin() and current_path().

<?php

function MYTHEME_process_page(&$variables) {
  if (path_is_admin(current_path())) {
    unset($variables['messages']);
  }
}

?>

Answer 3

To hide Error and Warnings using Admin panel goto

admin/config/development/logging

Select None to hide errors.

Answer 4

You can only make it so that the error shows on certain usernames, because sometimes they do give out helpful information like "Module Update reminder" etc.

function MYTHEME_process_page(&$variables) {
  global $user;
  if (path_is_admin(current_path()) == TRUE) {
    if(!in_array($user->name,array('username1','username2'))) {
       $variables['show_messages'] = FALSE;
  }
}

You can replace/add to array username1 and username2 with whatever usernames you would wish to show the error messages to.