The third parameter to the unique rule allows you to specify an id of a record to ignore. When you're editing a user, you want your unique validation rule to ignore the value contained by the id of the user you are editing.
'email'=>'required|email|unique:users,email,'.$userId
You can see the docs on the validation rule here.
The trickiest part you'll run into is figuring out how to edit your rule to provide the id of the user you're editing. That all depends on how you have your rules set up and where you're doing your validation.
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