Как сделать поиск?

error_reporting(E_ALL);
ini_set('display_errors', 1);
ini_set('display_errors','On');

$search_q=$_GET['search_q'];

$l= mysqli_connect('localhost', '', '', '');
$search_q = trim($search_q);

$search_q = strip_tags($search_q);

$q= mysqli_query($l, "SELECT name, author FROM `book` WHERE name LIKE '%$search_q%' OR author LIKE '%$search_q%'");

while ($row = $q->fetch_assoc()) {
    printf("%s (%s)\n",$row["name"],$row["author"]);
}

mysqli_free_result($q);

mysqli_close($l);

WHERE name LIKE '%$search_q%' AND author LIKE '%$search_q%'

$row = $q->fetch_assoc();
if($row) {
while ($row = ) {
    printf("%s (%s)\n",$row["name"],$row["author"]);
}
} else {
echo 'ничего не найдено';
}