Online PHP editor | refs for YJEMF

<?php $array = [ [ 'id' => 1, 'email_id' => 'ok@gmail.com', 'password' => 'test' ], [ 'id' => 2, 'email_id' => 'check@gmail.com', 'password' => 'test' ], [ 'id' => 3, 'email_id' => 'an@gmail.com', 'password' => 'pass' ] ]; var_export( array_values( array_reduce( $array, function($result, $row) { if (!isset($result[$row['password']])) { $result[$row['password']] = $row; } else { if (isset($result[$row['password']]['id'])) { $result[$row['password']] = [$result[$row['password']]]; } $result[$row['password']][] = $row; } return $result; }, [] ) ) );