<?php

    define('PAGE_WIDTH', 612);

    define('PAGE_HEIGHT', 792);

    $pdf = pdf_new();

    pdf_begin_document($pdf, "", "");

    pdf_begin_page($pdf, PAGE_WIDTH, PAGE_HEIGHT);

    /* Code to display content in the page here */

    pdf_end_page($pdf);

    pdf_end_document($pdf, "");

    $data = pdf_get_buffer($pdf);

    header('Content-type: application/pdf');

    header("Content-disposition: inline; filename=example1.pdf");

    header("Content-length: " . strlen($data));

    echo $data;

?>