Displays login datetime in manage users screen and sorts users by last login time.

Use this plugin to display last login of users.

https://wordpress.org/plugins/user-last-login/

Unique Validation on update in laravel

Create below rule to check the unique on update in laravel

$rules = array('email' => 'required|unique:users,email,[Enter Id here]');
$validator = Validator::make(Input::all(), $rules);

Get column name and its information from table in mysql

Please write below query:

select COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, 
       NUMERIC_PRECISION, DATETIME_PRECISION, 
       IS_NULLABLE 
from INFORMATION_SCHEMA.COLUMNS
where TABLE_NAME='tablename'