php db new PDO mysql host 127 dbname ebemaspnet root test db- query SE

<?php

$db = new PDO('mysql:host=127.0.0.1;dbname=ebemaspnet', 'root', '');

$test = $db->query('SELECT `key` FROM `test`')->fetchAll();

$array = [];

foreach($test as $key => $data){
	$array[$key] = md5($data['key']);
}

echo count($array);

?>