<?php $arr = [ [ 'firstName' => 'T', 'lastName' => 'B', 'email' => 'glh@gmail.com' ], [ 'firstName' => 'L', 'lastName' => 'Kr', 'email' => 'email1@gmail.com' ], [ 'firstName' => 'T', 'lastName' => 'B', 'email' => 'glh@gmail.com' ] ]; $res = array_intersect_key($arr, array_unique(array_column($arr, 'email'))); print_r($res);
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