Error when trying to make a PDF format

Hi, I'm trying to make a PDF format for my web system but I'm starting and it sends me an error.

  

Parse error: syntax error, unexpected '$ this' (T_VARIABLE), expecting ',' or ')' in C: \ xampp \ htdocs \ testpdf \ report.php on line 23

This is my code for a file

function Footer(){ 

    $this->SetY(-15);
    $this->SetFont('Arial','I',8);
    $this->Cell(0,10, 'Pagina ' $this->PageNo().'/{nb}',0,0,'C' ); 
}

And this is my code from another file:

<?php 

    include 'reporte.php';
    require 'conexion.php';

    $query = "SELECT * FROM mvs";
    $resultado = $mysqli->query($query);


    $pdf = new REPORTE(); // Recibe parametros para el tamaño de la hoja (se pueden meter arreglos)
    $pdf->AliasPages(); //Esta linea sirve para poner en funcionamiento la variable nb
    $pdf->Addpage();

    $pdf->SetFillColor(232,232,232);
    $pdf->SetFont('Arial','B',12); //Asigna valores para el contenido 

    $pdf->Cell(70,6,'MVS',1,0,'C',1); //Crea celdas decontenido
    $pdf->Cell(20,6,'ID',1,0,'C',1);
    $pdf->Cell(70,6,'VALOR',1,0,'C',1);

    $pdf->output(); 
?>

But I can not find my mistake ... Could you help me?