ArrayAsosiatif ft looping

<?php
    $siswa = array('1234567894' => 'Wanda', '1234567895' => 'Natasha', '1234567896' => 'Carol');

    foreach ($siswa as $nis => $nm_siswa) {
        echo $nm_siswa .'memiliki NIS'. $nis. '<br>';
    }
?>