Error trying to use mysqli_fetch ()

I'm trying to use mysqli_fetch () to transform my result from mysql into an array but php returns me the following message: Fatal error: Call to undefined function mysqli_fetch ()

This is the function I'm using

public function PopulaPerfil()
{
    include("conexao.php");

    $cd = $_SESSION['cd_usuario'];
    $query ="SELECT * FROM tb_usuario WHERE cd_usuario = '$cd' ";
    $result = mysqli_query($conexao,$query);
    $resultArray= mysqli_fetch($result);
    return $resultArray;
    die();
}