title: Laravel array validation for unique attribute in array but not required to be unique in table
body: <p>I have an array in php. i need to validate array such that each abc_id should be unique in array but not required to be unique in database table.</p>
  
  <pre><code>$validator = Validator::make($request-&gt;all(), [
   'tests.*.*.abc_id' =&gt; 'should not be same in array' 
   ]);
  </code></pre>
  
  <p>Thanks in Advance.</p>