Undefined variable in FPDF. help me. mysqli - pdf

Question

why Notice: Undefined variable: datanya?
can you fixed? this is my code:
how do i fix it.
require("fpdf.php");
$konek=mysqli_connect("localhost","root","","rollab");
$kode=$_GET['kode'];
$query=mysqli_query($konek,"select*from wp_jadwal where id_jadwal='.$kode.'");
$datanya =mysqli_fetch_assoc($query);
class myPDF extends FPDF{
function headerPro(){
$this->Ln(13);
$this->Cell(40,5,$datanya["tanggalpemutaran"],0,0,'L');
$this->Ln();
}
}

Answer 1

You should check out this FAQ of FPDF. It's for the default Header/Footer methods but it's the same issue:
5. I try to display a variable in the Header method but nothing prints.
You have to use the global keyword to access global variables, for example:
function Header()
{
global $title;
$this->SetFont('Arial', 'B', 15);
$this->Cell(0, 10, $title, 1, 1, 'C');
}
$title = 'My title';
Alternatively, you can use an object property:
function Header()
{
$this->SetFont('Arial', 'B', 15);
$this->Cell(0, 10, $this->title, 1, 1, 'C');
}
$pdf->title = 'My title';