How to override core module drupal functions

You can write form_alter hook

function your_module_name_form_alter(&$form, $form_state, $form_id) {
if ($form_id == 'user-login-form') {
$form['#redirect']=Your-path;

}
}

You can use hook_form_alter() to alter the login form and add your validation handler (which queries your app, gets the userID, writes it into the DB..).

See these Drupal 6 migration resources for more info: 1 and 2

In this particular function, I needed to change $header and change $query: add a column to the users table and get a field created by fields. Finally, sort that colunm also... Later on, we add to $options :

$options[$account->uid] = array(
...
'full_name' => $account->field_nom_value . ", " . $account->field_pr_nom_value,
..

I found a way to do what I want without hacking core but it feels awfully "wrong".

-create customfunctions_admin_account() in customfunctions.module (a module I created)
-copy in it, the function user_admin_account() and do my alterations.
-customfunctions_menu_alter() to take my function instead of the core one...

Works well, only thing though is that other modules (such has role_delgation) alter user_admin_account(), which is a form btw.

Other modules might has well so I had to copy and rename in my case from role_delegation module the function : role_delegation_form_user_admin_account_alter() to customfunctions_form_customfunctions_admin_account_alter().

Not to mention had to copy the validate and submit functions from user_admin_account() -> customfunctions_admin_account_validate and customfunctions_admin_account_submit().

After done all this, works fine but it would seem that hacking core would be simpler if other modules might alter this core function...

Any suggestions ?

Hi, 

I am using Drupal 8.

In drupal form I am displaying some error messages. The changes i need is, to display the error message according to my customer needs. Whenever a required field is missed, drupal lists the error messages as,

2 error has been found:(Error message 1 here) (Error message 2 here).

But what my customer need is, 

Errors:

Error message 1

Error message 2

But the problem is, i need to make changes in the core module,

PATH : (core/modules/inline_form_errors/src/FormErrorHandler.php),  Where the "1 error has been found" and "@count error has been found" is mentioned. (@count represents the number of errors that was caught).

I need to edit and remove the "Error has been found " text from the core module. So without making changes in core, is there any other way to implement this ?

Thanks.

I want to store them in Amazon's S3 so I can access them from different servers.