<?php  //create file  $fp = fopen('hello.pdf', 'w');  if(!$fp)  {    echo "Error: could not create the PDF file";    exit;  }  // start the pdf document  $pdf = pdf_open($fp);  pdf_set_info($pdf, "Creator", "pdftest.php");  pdf_set_info($pdf, "Author", "Luke Welling and Laura Thomson");  pdf_set_info($pdf, "Title", "Hello World (PHP)");  // US letter is 11" x 8.5" and there are 72 points per inch  pdf_begin_page($pdf, 8.5*72, 11*72);  pdf_add_outline($pdf, 'Page 1');  $font = pdf_findfont($pdf, 'Times-Roman', 'host', 0);  pdf_setfont($pdf, $font, 24);  pdf_set_text_pos($pdf, 50, 700);  // write text  pdf_show($pdf,'Hello,world!');  pdf_continue_text($pdf,'(says PHP)');  // end the document  pdf_end_page($pdf);  pdf_close($pdf);  fclose($fp);     // display a link to download  echo "download the pdf <a href = 'hello.pdf'>here</a>";?>