laravel validation rules unique multiple columns != code example

Example 1: unique check with multiple columns laravel validation

'name' => 'unique:table,field,NULL,id,field1,value1,field2,value2,field3,value3'

Example 2: laravel unique validation on multiple columns

'mobile_no' 
  => 'unique:users,mobile_no,NULL,id,country_id,'.request('country_id');