HTML conversion

Add-On HTML conversion

Informations

Author:Radek Hulán
License: GPL

Description

This class allows to convert HTML to PDF. It was designed to export my blog entries to PDFs.
Main features are:
  • support for bold, italics, underlined text
  • support for headlines <h1>, <h2>, <h3> and <h4>
  • support for images
  • basic support for tables
  • full support for lists <li>
  • full support for <blockquote>
  • support for pseudo-tags <red> and <blue>
  • <pre> will be displayed using Courier font, other text with Times
  • support for <br>, <br /> and <p>
  • support for <hr> and <hr />
  • document header is created with article title, URL, author, and publishing date
  • document footer is created with current and total page numbers
  • built-in support for iconv (character conversions)

Source

<?php
/***************************/ 
/* Radek HULAN             */
/* http://hulan.info/blog/ */
/***************************/ 

require('fpdf.php');

/************************************/
/* global functions                 */
/************************************/
function hex2dec($color = "#000000"){
    $tbl_color = array();
    $tbl_color['R']=hexdec(substr($color, 1, 2));
    $tbl_color['G']=hexdec(substr($color, 3, 2));
    $tbl_color['B']=hexdec(substr($color, 5, 2));
    return $tbl_color;
}

function px2mm($px){
    return $px*25.4/72;
}

function txtentities($html){
    $trans = get_html_translation_table(HTML_ENTITIES);
    $trans = array_flip($trans);
    return strtr($html, $trans);
}


/************************************/
/* main class createPDF             */
/************************************/
class createPDF {
    protected $html;
    protected $title;
    protected $articleurl;
    protected $author;
    protected $date;
    protected $from;
    protected $to;
    protected $useiconv;
    protected $bi;

    function __construct($_html, $_title, $_articleurl, $_author, $_date) {
        // main vars
        $this->html=$_html;               // html text to convert to PDF
        $this->title=$_title;             // article title
        $this->articleurl=$_articleurl;   // article URL
        $this->author=$_author;           // article author
        $this->date=$_date;               // date being published
        // other options
        $this->from='iso-8859-2';         // input encoding
        $this->to='cp1250';               // output encoding
        $this->useiconv=false;            // use iconv
        $this->bi=true;                   // support bold and italic tags
    }

    function _convert($s) {
        if ($this->useiconv) 
            return iconv($this->from, $this->to, $s); 
        else 
            return $s;
    }

    function run() {
        // change some win codes, and xhtml into html
        $str=array(
        '<br />' => '<br>', 
        '<hr />' => '<hr>', 
        '[r]' => '<red>', 
        '[/r]' => '</red>', 
        '[l]' => '<blue>', 
        '[/l]' => '</blue>', 
        '&#8220;' => '"', 
        '&#8221;' => '"', 
        '&#8222;' => '"', 
        '&#8230;' => '...', 
        '&#8217;' => '\''
        );
        foreach ($str as $_from => $_to) $this->html = str_replace($_from, $_to, $this->html);

        $pdf=new PDF('P', 'mm', 'A4', $this->title, $this->articleurl, false);
        $pdf->SetCreator("Script by Radek HULAN, http://hulan.info/blog/");
        $pdf->SetDisplayMode('real');
        $pdf->SetTitle($this->_convert($this->title));
        $pdf->SetAuthor($this->author);
        $pdf->AddPage();

        // header
        $pdf->PutMainTitle($this->_convert($this->title));
        $pdf->PutMinorHeading('Article URL');
        $pdf->PutMinorTitle($this->articleurl, $this->articleurl);
        $pdf->PutMinorHeading('Author');
        $pdf->PutMinorTitle($this->_convert($this->author));
        $pdf->PutMinorHeading("Published: ".@date("F j, Y, g:i a", $this->date));
        $pdf->PutLine();
        $pdf->Ln(10);

        // html
        $pdf->WriteHTML($this->_convert($this->html), $this->bi);

        // output
        $pdf->Output();

        // stop processing
        exit;
    }
} 

/************************************/
/* class PDF                        */
/************************************/
class PDF extends FPDF
{
    protected $B;
    protected $I;
    protected $U;
    protected $HREF;
    protected $PRE;
    protected $fontlist;
    protected $issetfont;
    protected $issetcolor;
    protected $articletitle;
    protected $articleurl;
    protected $debug;
    protected $bi;

    function __construct($orientation='P', $unit='mm', $size='A4', $_title='', $_url='', $_debug=false)
    {
        parent::__construct($orientation, $unit, $size);
        $this->B=0;
        $this->I=0;
        $this->U=0;
        $this->HREF='';
        $this->PRE=false;
        $this->SetFont('Times', '', 12);
        $this->fontlist=array('Times', 'Courier');
        $this->issetfont=false;
        $this->issetcolor=false;
        $this->articletitle=$_title;
        $this->articleurl=$_url;
        $this->debug=$_debug;
        $this->AliasNbPages();
    }

    function WriteHTML($html, $bi)
    {
        //remove all unsupported tags
        $this->bi=$bi;
        if ($bi)
            $html=strip_tags($html, "<a><img><p><br><font><tr><blockquote><h1><h2><h3><h4><pre><red><blue><ul><li><hr><b><i><u><strong><em>"); 
        else
            $html=strip_tags($html, "<a><img><p><br><font><tr><blockquote><h1><h2><h3><h4><pre><red><blue><ul><li><hr>"); 
        $html=str_replace("\n", ' ', $html); //replace carriage returns with spaces
        // debug
        if ($this->debug) { echo $html; exit; }

        $html = str_replace('&trade;', '™', $html);
        $html = str_replace('&copy;', '©', $html);
        $html = str_replace('&euro;', '€', $html);

        $a=preg_split('/<(.*)>/U', $html, -1, PREG_SPLIT_DELIM_CAPTURE);
        $skip=false;
        foreach($a as $i=>$e)
        {
            if (!$skip) {
                if($this->HREF)
                    $e=str_replace("\n", "", str_replace("\r", "", $e));
                if($i%2==0)
                {
                    // new line
                    if($this->PRE)
                        $e=str_replace("\r", "\n", $e);
                    else
                        $e=str_replace("\r", "", $e);
                    //Text
                    if($this->HREF) {
                        $this->PutLink($this->HREF, $e);
                        $skip=true;
                    } else 
                        $this->Write(5, txtentities($e));
                } else {
                    //Tag
                    if (substr(trim($e), 0, 1)=='/')
                        $this->CloseTag(strtoupper(substr($e, strpos($e, '/'))));
                    else {
                        //Extract attributes
                        $a2=explode(' ', $e);
                        $tag=strtoupper(array_shift($a2));
                        $attr=array();
                        foreach($a2 as $v) {
                            if(preg_match('/([^=]*)=["\']?([^"\']*)/', $v, $a3))
                                $attr[strtoupper($a3[1])]=$a3[2];
                        }
                        $this->OpenTag($tag, $attr);
                    }
                }
            } else {
                $this->HREF='';
                $skip=false;
            }
        }
    }

    function OpenTag($tag, $attr)
    {
        //Opening tag
        switch($tag){
            case 'STRONG':
            case 'B':
                if ($this->bi)
                    $this->SetStyle('B', true);
                else
                    $this->SetStyle('U', true);
                break;
            case 'H1':
                $this->Ln(5);
                $this->SetTextColor(150, 0, 0);
                $this->SetFontSize(22);
                break;
            case 'H2':
                $this->Ln(5);
                $this->SetFontSize(18);
                $this->SetStyle('U', true);
                break;
            case 'H3':
                $this->Ln(5);
                $this->SetFontSize(16);
                $this->SetStyle('U', true);
                break;
            case 'H4':
                $this->Ln(5);
                $this->SetTextColor(102, 0, 0);
                $this->SetFontSize(14);
                if ($this->bi)
                    $this->SetStyle('B', true);
                break;
            case 'PRE':
                $this->SetFont('Courier', '', 11);
                $this->SetFontSize(11);
                $this->SetStyle('B', false);
                $this->SetStyle('I', false);
                $this->PRE=true;
                break;
            case 'RED':
                $this->SetTextColor(255, 0, 0);
                break;
            case 'BLOCKQUOTE':
                $this->mySetTextColor(100, 0, 45);
                $this->Ln(3);
                break;
            case 'BLUE':
                $this->SetTextColor(0, 0, 255);
                break;
            case 'I':
            case 'EM':
                if ($this->bi)
                    $this->SetStyle('I', true);
                break;
            case 'U':
                $this->SetStyle('U', true);
                break;
            case 'A':
                $this->HREF=$attr['HREF'];
                break;
            case 'IMG':
                if(isset($attr['SRC']) && (isset($attr['WIDTH']) || isset($attr['HEIGHT']))) {
                    if(!isset($attr['WIDTH']))
                        $attr['WIDTH'] = 0;
                    if(!isset($attr['HEIGHT']))
                        $attr['HEIGHT'] = 0;
                    $this->Image($attr['SRC'], $this->GetX(), $this->GetY(), px2mm($attr['WIDTH']), px2mm($attr['HEIGHT']));
                    $this->Ln(3);
                }
                break;
            case 'LI':
                $this->Ln(2);
                $this->SetTextColor(190, 0, 0);
                $this->Write(5, '     » ');
                $this->mySetTextColor(-1);
                break;
            case 'TR':
                $this->Ln(7);
                $this->PutLine();
                break;
            case 'BR':
                $this->Ln(2);
                break;
            case 'P':
                $this->Ln(5);
                break;
            case 'HR':
                $this->PutLine();
                break;
            case 'FONT':
                if (isset($attr['COLOR']) && $attr['COLOR']!='') {
                    $coul=hex2dec($attr['COLOR']);
                    $this->mySetTextColor($coul['R'], $coul['G'], $coul['B']);
                    $this->issetcolor=true;
                }
                if (isset($attr['FACE']) && in_array(strtolower($attr['FACE']), $this->fontlist)) {
                    $this->SetFont(strtolower($attr['FACE']));
                    $this->issetfont=true;
                }
                break;
        }
    }

    function CloseTag($tag)
    {
        //Closing tag
        if ($tag=='H1' || $tag=='H2' || $tag=='H3' || $tag=='H4'){
            $this->Ln(6);
            $this->SetFont('Times', '', 12);
            $this->SetFontSize(12);
            $this->SetStyle('U', false);
            $this->SetStyle('B', false);
            $this->mySetTextColor(-1);
        }
        if ($tag=='PRE'){
            $this->SetFont('Times', '', 12);
            $this->SetFontSize(12);
            $this->PRE=false;
        }
        if ($tag=='RED' || $tag=='BLUE')
            $this->mySetTextColor(-1);
        if ($tag=='BLOCKQUOTE'){
            $this->mySetTextColor(0, 0, 0);
            $this->Ln(3);
        }
        if($tag=='STRONG')
            $tag='B';
        if($tag=='EM')
            $tag='I';
        if((!$this->bi) && $tag=='B')
            $tag='U';
        if($tag=='B' || $tag=='I' || $tag=='U')
            $this->SetStyle($tag, false);
        if($tag=='A')
            $this->HREF='';
        if($tag=='FONT'){
            if ($this->issetcolor==true) {
                $this->SetTextColor(0, 0, 0);
            }
            if ($this->issetfont) {
                $this->SetFont('Times', '', 12);
                $this->issetfont=false;
            }
        }
    }

    function Footer()
    {
        //Go to 1.5 cm from bottom
        $this->SetY(-15);
        //Select Arial italic 8
        $this->SetFont('Times', '', 8);
        //Print centered page number
        $this->SetTextColor(0, 0, 0);
        $this->Cell(0, 4, 'Page '.$this->PageNo().'/{nb}', 0, 1, 'C');
        $this->SetTextColor(0, 0, 180);
        $this->Cell(0, 4, 'Created by HTML2PDF / FPDF', 0, 0, 'C', 0, 'http://hulan.info/blog/');
        $this->mySetTextColor(-1);
    }

    function Header()
    {
        //Select Arial bold 15
        $this->SetTextColor(0, 0, 0);
        $this->SetFont('Times', '', 10);
        $this->Cell(0, 10, $this->articletitle, 0, 0, 'C');
        $this->Ln(4);
        $this->Cell(0, 10, $this->articleurl, 0, 0, 'C');
        $this->Ln(7);
        $this->Line($this->GetX(), $this->GetY(), $this->GetX()+187, $this->GetY());
        //Line break
        $this->Ln(12);
        $this->SetFont('Times', '', 12);
        $this->mySetTextColor(-1);
    }

    function SetStyle($tag, $enable)
    {
        $this->$tag+=($enable ? 1 : -1);
        $style='';
        foreach(array('B', 'I', 'U') as $s) {
            if($this->$s>0)
                $style.=$s;
        }
        $this->SetFont('', $style);
    }

    function PutLink($URL, $txt)
    {
        //Put a hyperlink
        $this->SetTextColor(0, 0, 255);
        $this->SetStyle('U', true);
        $this->Write(5, $txt, $URL);
        $this->SetStyle('U', false);
        $this->mySetTextColor(-1);
    }

    function PutLine()
    {
        $this->Ln(2);
        $this->Line($this->GetX(), $this->GetY(), $this->GetX()+187, $this->GetY());
        $this->Ln(3);
    }

    function mySetTextColor($r, $g=0, $b=0){
        static $_r=0, $_g=0, $_b=0;

        if ($r==-1) 
            $this->SetTextColor($_r, $_g, $_b);
        else {
            $this->SetTextColor($r, $g, $b);
            $_r=$r;
            $_g=$g;
            $_b=$b;
        }
    }

    function PutMainTitle($title) {
        if (strlen($title)>55)
            $title=substr($title, 0, 55)."...";
        $this->SetTextColor(33, 32, 95);
        $this->SetFontSize(20);
        $this->SetFillColor(255, 204, 120);
        $this->Cell(0, 20, $title, 1, 1, "C", 1);
        $this->SetFillColor(255, 255, 255);
        $this->SetFontSize(12);
        $this->Ln(5);
    }

    function PutMinorHeading($title) {
        $this->SetFontSize(12);
        $this->Cell(0, 5, $title, 0, 1, "C");
        $this->SetFontSize(12);
    }

    function PutMinorTitle($title, $url='') {
        $title=str_replace('http://', '', $title);
        if (strlen($title)>70)
            if (!(strrpos($title, '/')==false))
                $title=substr($title, strrpos($title, '/')+1);
        $title=substr($title, 0, 70);
        $this->SetFontSize(16);
        if ($url!='') {
            $this->SetStyle('U', false);
            $this->SetTextColor(0, 0, 180);
            $this->Cell(0, 6, $title, 0, 1, "C", 0, $url);
            $this->SetTextColor(0, 0, 0);
            $this->SetStyle('U', false);
        } else
            $this->Cell(0, 6, $title, 0, 1, "C", 0);
        $this->SetFontSize(12);
        $this->Ln(4);
    }
} // class PDF

?>

Example

Here's a form where the user can input some HTML and convert it to PDF: 
<?php
/***************************/ 
/* Radek HULAN             */
/* http://hulan.info/blog/ */
/***************************/ 

require('html2pdf.php');

if(isset($_POST['html']))
{
    $pdf = new createPDF(
        $_POST['html'],   // html text to publish
        $_POST['title'],  // article title
        $_POST['url'],    // article URL
        $_POST['author'], // author name
        time()
    );
    $pdf->run();
}
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>HTML2PDF</title>
<style type='text/css'>
  fieldset{padding:10px}
  body{font-size:small}
</style>
</head><body>
<h1>HTML2PDF</h1>
  <form name="pdfgen" method="post" target="_blank" action="<?php echo $_SERVER['PHP_SELF']; ?>">
  <div>
    <fieldset><legend>HTML2PDF</legend>
    <p>Title: <input type="text" maxlength="30" name="title"></p>
    <p>URL: <input type="text" maxlength="30" name="url"></p>
    <p>Author: <input type="text" maxlength="30" name="author"></p>
    <p><textarea name="html" cols="50" rows="15"></textarea></p>
    <p><input type="submit" value="Generate PDF"></p>
    </fieldset>
  </div>
  </form>
</body></html>

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