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>

Download

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Es ist ein Fehler aufgetreten

Was ist das Problem?

Bei der Ausführung des Skriptes ist ein Fehler aufgetreten. Irgendetwas funktioniert nicht richtig.

Wie kann ich das Problem lösen?

Öffnen Sie die aktuelle Log-Datei im Ordner var/logs bzw. app/logs und suchen Sie die zugehörige Fehlermeldung (normalerweise die letzte).

Weitere Informationen

Die Skriptausführung wurde gestoppt, weil irgendetwas nicht korrekt funktioniert. Die eigentliche Fehlermeldung wird aus Sicherheitsgründen hinter dieser Meldung verborgen und findet sich in der aktuellen Log-Datei (siehe oben). Wenn Sie die Fehlermeldung nicht verstehen oder nicht wissen, wie das Problem zu beheben ist, durchsuchen Sie die Contao-FAQs oder besuchen Sie die Contao-Supportseite.