PDFlib Cookbook

cookbook

pdf_import/stamp_pages

Place a stamp on the pages of an existing PDF document.

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<?php
/*
 * Stamp PDF pages:
 * Import all pages from an existing PDF document and place a stamp somewhere
 * on the page
 *
 * Required software: PDFlib+PDI/PPS 9
 * Required data: PDF document
 */
/* This is where the data files are. Adjust as necessary. */
$searchpath = dirname(__FILE__,3)."/input";
$outfile = "";
$title = "Stamp Pages";

$pdffile = "PDFlib-real-world.pdf";

try {
    $p = new pdflib();

    $p->set_option("searchpath={" . $searchpath . "}");

    /* This means we must check return values of load_font() etc. */
    $p->set_option("errorpolicy=return");
    $p->set_option("stringformat=utf8");

    if ($p->begin_document($outfile, "") == 0)
        throw new Exception("Error: " . $p->get_errmsg());

    $p->set_info("Creator", "PDFlib Cookbook");
    $p->set_info("Title", $title );

    /* Open the input PDF */
    $indoc = $p->open_pdi_document($pdffile, "");
    if ($indoc == 0)
        throw new Exception("Error: " . $p->get_errmsg());

    $endpage = (int) $p->pcos_get_number($indoc, "length:pages");

    /* Loop over all pages of the input document */
    for ($pageno = 1; $pageno <= $endpage; $pageno++)
    {
        $page = $p->open_pdi_page($indoc, $pageno, "");

        if ($page == 0)
            throw new Exception("Error: " . $p->get_errmsg());

        /* Page size may be adjusted by fit_pdi_page() */
        $p->begin_page_ext(0, 0, "width=a4.width height=a4.height");

        /* Place the imported page on the output page, and
         * adjust the page size
         */
        $p->fit_pdi_page($page, 0, 0, "adjustpage");

        $font = $p->load_font("Helvetica-Bold", "unicode", "");

        if ($font == 0)
            throw new Exception("Error: " . $p->get_errmsg());

        /* Fit the text line like a stamp with red outlines in the
         * specified box. The stamp will be placed diagonally from the 
         * upper left to the lower right.
         */
        $p->fit_textline("PRELIMINARY", 50, 50, "font=" . $font .
           " fontsize=1 textrendering=1 boxsize={500 700} stamp=ul2lr" .
           " strokecolor=red strokewidth=2");

        $p->close_pdi_page($page);

        $p->end_page_ext("");
    }

    $p->end_document("");

    $buf = $p->get_buffer();
    $len = strlen($buf);

    header("Content-type: application/pdf");
    header("Content-Length: $len");
    header("Content-Disposition: inline; filename=stamp_pages.pdf");
    print $buf;
}
catch (PDFlibException $e) {
    echo("PDFlib exception occurred in stamp_pages sample:\n" .
        "[" . $e->get_errnum() . "] " . $e->get_apiname() . ": " .
        $e->get_errmsg() . "\n");
    exit(1);
}
catch (Exception $e) {
    echo($e);
    exit(1);
}

$p = 0;

?>