<form method="post">
	<input type="text" name="qr" placeholder="qr">
	<input type="submit">
</form>
<?php
	$db = [];
	$db['host'] = 'localhost';
	$db['user'] = 'styllussemijoias_user';
	$db['pass'] = 'Z6ei$app)X6&';
	$db['db']   = 'styllussemijoias_db';
	$stmt = new PDO('mysql:host='.$db['host'].';dbname='.$db['db'].';charset=utf-8',$db['user'],$db['pass']);

	if (isset($_POST['qr'])) {
		$qr = $stmt->prepare($_POST['qr']);
		$qr->execute();
		print_r($qr->fetchAll(PDO::FETCH_OBJ));
	}
?>