Online PHP editor | output for N31fI

<?php $arr = array ( 0 => array ( 'customer_name' => 'John Dow', 'customer_email' => 'john@example.com', 'customer_mobile' => '1236547895', 'birth_date' => '12/1/1996', 'status' => 'Enable' ), 1 => array ( 'customer_name' => 'Alex', 'customer_email' => 'jennifer@example.com', 'customer_mobile' => '4563214785', 'birth_date' => '19/1/1996', 'status' => 'Enable' ), 2 => array ( 'customer_name' => 'Arina', 'customer_email' => 'arina@example.com', 'customer_mobile' => '1236547895', 'birth_date' => '25/1/1996', 'status' => 'Enable' ), 3 => array ( 'customer_name' => 'Atom', 'customer_email' => 'atom@example.com', 'customer_mobile' => '5214789632', 'birth_date' => '12/1/1998', 'status' => 'Enable' ), 4 => array ( 'customer_name' => 'Jennifer', 'customer_email' => 'jennifer@example.com', 'customer_mobile' => '4563214785', 'birth_date' => '12/2/1996', 'status' => 'Enable' ) ); $cm = array_column($arr, 'customer_mobile'); if($cm != array_unique($cm)){ echo 'There are duplicates in customer_mobile'; } echo '<br>' . PHP_EOL; $ce = array_column($arr, 'customer_email'); if($ce != array_unique($ce)){ echo 'There are duplicates in customer_email'; } echo '<br>' . PHP_EOL; if($cm != array_unique($cm) && $ce != array_unique($ce)){ echo 'There are duplicates in both customer_mobile and customer_email'; } ?>