how to stop custom validator to validate other values of an array in laravel code example

Example 1: laravel unique validation

unique:table,column,except,idColumn

############## Example : ################

############### For Updating  
//rules
'email' => 'unique:users,email_address,' . $userId,

############### For Creating 
//rules
'email' => 'unique:users,email_address',

Example 2: validate field for existing client laravel

unique:users,username,id,1 // table, field, idcolumn, value to ignore