如何计算查询结果行数？

Question

我应该用什么来替换'code TO VERIFY IF QUERY RESULT ROW IS=1'？
我用num_rows尝试了很多种方法，但都行不通。

我的PHP代码：

    $con=mysqli_connect("localhost","mbrconsu_un394x","y1cz9,rd+hf6","mbrconsu_mmx");

    if (mysqli_connect_errno($con))
    {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    }

    $usuario = $con->real_escape_string($_GET['usuario']);
    $senha = $con->real_escape_string($_GET['senha']);

        $query = mysqli_query($con, "SELECT * FROM 'login' WHERE usuario = '$usuario' AND senha='$senha'");

        if(CODE TO VERIFY IF QUERY RESULT ROW IS = 1){
            while($row = mysqli_fetch_assoc($query)){
                $db_username = $row['usuario'];
                $db_password = $row['senha'];
            }
            if($usuario == $db_username && $senha == $db_password){
                return true;
            }
            } else {
            return false;
        }

    mysqli_close($con);
?>

Answer 1

$query->num_rows;

或

mysqli_num_rows($query);