define('PAGE_WIDTH', 612);
define('PAGE_HEIGHT', 792);
$pdf = pdf_new();
pdf_begin_document($pdf, "", "");
$pattern = pdf_begin_pattern($pdf, 21, 21, 22, 22, 1);
pdf_setcolor($pdf, "stroke", "rgb", 0.0, 0.0, 1.0, 0);
pdf_circle($pdf, 11, 11, 10);
pdf_stroke($pdf);
pdf_end_pattern($pdf);
pdf_begin_page($pdf, PAGE_WIDTH, PAGE_HEIGHT);
pdf_setcolor($pdf, "fill", "pattern", $pattern, 0, 0, 0);
pdf_circle($pdf, PAGE_WIDTH/2, PAGE_HEIGHT/2, 150);
pdf_fill_stroke($pdf);
pdf_end_page($pdf);
pdf_end_document($pdf, "");
$data = pdf_get_buffer($pdf);
header('Content-type: application/pdf');
header("Content-disposition: inline; filename=mypdf.pdf");
header("Content-length: " . strlen($data));
echo $data;
?>