用于轉換PDF，TXT，HTML和圖片的實用PHP代碼片段

以下是一些用于轉換PDF，TXT，HTML和圖片的實用PHP代碼片段。

將PDF轉成JPG格式的圖片 - PDF2JPG

需要先安裝 Image Magic 擴展。簡單和非常實用的代碼片段用于將PDF文件轉成JPG格式的圖片。

 /**
     * PDF2JPG script
     * with ImageMagick
     */

    $pdf_file = './pdf/_folder/example.pdf';
    $save_to = './image_folder/example.jpg'; //make sure that apache has permissions to write in this folder! (common problem)

    //execute ImageMagick command 'convert' and convert PDF to JPG with applied settings
    exec('convert "'.$pdf_file.'" -colorspace RGB -resize 800 "'.$save_to.'"', $output, $return_var);


    if($return_var == 0) { //if exec successfuly converted pdf to jpg
    print "Conversion OK";
    }
    else print "Conversion failed.<br />".$output;

html2ps - 將 HTML 轉成 pdf

這絕對是非常有用的片段，將HTML轉換為PDF文件。我曾在幾個項目中使用它。

    /*******************************************************************************
     *
     */
    function convert_to_pdf($url, $path_to_pdf) {
    require_once(dirname(__FILE__).'/html2ps/config.inc.php');
    require_once(HTML2PS_DIR.'pipeline.factory.class.php');
    echo WRITER_TEMPDIR;
    //error_reporting(E_ALL);
    //ini_set("display_errors","1");
    @set_time_limit(10000);
    parse_config_file(HTML2PS_DIR.'html2ps.config');

    /**
      * Handles the saving  of  generated PDF to user-defined output file on server
      */
    class MyDestinationFile extends Destination {
    /**
      * @var String result file name / path
      * @access private
      */
    var $_dest_filename;

    function MyDestinationFile($dest_filename) {
    $this->_dest_filename = $dest_filename;
    }

    function process($tmp_filename, $content_type) {
    copy($tmp_filename, $this->_dest_filename);
    }
    }


    $media = Media::predefined("A4");
    $media->set_landscape(false);
    $media->set_margins(array('left' => 5,
    'right' => 5,
    'top' => 10,
    'bottom' => 10));
    $media->set_pixels(800);

    $pipeline = PipelineFactory::create_default_pipeline("", // Auto-detect encoding
    "");
    // Override HTML source
    $pipeline->fetchers[] = new FetcherURL;
    $pipeline->data_filters[] = new DataFilterHTML2XHTML;
    $pipeline->parser = new ParserXHTML;
    $pipeline->layout_engine = new LayoutEngineDefault;

    $pipeline->output_driver = new OutputDriverFPDF($media);
    //$filter = new PreTreeFilterHeaderFooter("HEADER", "FOOTER");
    //$pipeline->pre_tree_filters[] = $filter;

    // Override destination to local file
    $pipeline->destination = new MyDestinationFile($path_to_pdf);

    global $g_config;
    $g_config = array(
    'cssmedia' => 'screen',
    'scalepoints' => '1',
    'renderimages' => true,
    'renderlinks' => true,
    'renderfields' => true,
    'renderforms' => false,
    'mode' => 'html',
    'encoding' => '',
    'debugbox' => false,
    'pdfversion' => '1.4',
    'draw_page_border' => false
    );
    $pipeline->configure($g_config);
    //$pipeline->add_feature('toc', array('location' => 'before'));
    $pipeline->process($url, $media);
    }

將HTML轉換為文本

如果您正在構建模擬器的搜索引擎，基于文本的瀏覽器，我覺得這可能來得心應手了。

        <?php
    // strip javascript, styles, html tags, normalize entities and spaces
    // based on http://www.php.net/manual/en/function.strip-tags.php#68757
    function html2text($html){
    $text = $html;
    static $search = array(
    '@<script.+?</script>@usi', // Strip out javascript content
    '@<style.+?</style>@usi', // Strip style content
    '@<!--.+?-->@us', // Strip multi-line comments including CDATA
    '@</?[a-z].*?\>@usi', // Strip out HTML tags
    );
    $text = preg_replace($search, ' ', $text);
    // normalize common entities
    $text = normalizeEntities($text);
    // decode other entities
    $text = html_entity_decode($text, ENT_QUOTES, 'utf-8');
    // normalize possibly repeated newlines, tabs, spaces to spaces
    $text = preg_replace('/\s+/u', ' ', $text);
    $text = trim($text);
    // we must still run htmlentities on anything that comes out!
    // for instance:
    // <<a>script>alert('XSS')//<<a>/script>
    // will become
    // <script>alert('XSS')//</script>
    return $text;
    }

    // replace encoded and double encoded entities to equivalent unicode character
    // also see /app/bookmarkletPopup.js
    function normalizeEntities($text) {
    static $find = array();
    static $repl = array();
    if (!count($find)) {
    // build $find and $replace from map one time
    $map = array(
    array('\'', 'apos', 39, 'x27'), // Apostrophe
    array('\'', ''', 'lsquo', 8216, 'x2018'), // Open single quote
    array('\'', ''', 'rsquo', 8217, 'x2019'), // Close single quote
    array('"', '"', 'ldquo', 8220, 'x201C'), // Open double quotes
    array('"', '"', 'rdquo', 8221, 'x201D'), // Close double quotes
    array('\'', ',', 'sbquo', 8218, 'x201A'), // Single low-9 quote
    array('"', ',,', 'bdquo', 8222, 'x201E'), // Double low-9 quote
    array('\'', '′', 'prime', 8242, 'x2032'), // Prime/minutes/feet
    array('"', '′′', 'Prime', 8243, 'x2033'), // Double prime/seconds/inches
    array(' ', 'nbsp', 160, 'xA0'), // Non-breaking space
    array('-', '-', 8208, 'x2010'), // Hyphen
    array('-', '-', 'ndash', 8211, 150, 'x2013'), // En dash
    array('--', '--', 'mdash', 8212, 151, 'x2014'), // Em dash
    array(' ', ' ', 'ensp', 8194, 'x2002'), // En space
    array(' ', ' ', 'emsp', 8195, 'x2003'), // Em space
    array(' ', ' ', 'thinsp', 8201, 'x2009'), // Thin space
    array('*', 'o', 'bull', 8226, 'x2022'), // Bullet
    array('*', '?', 8227, 'x2023'), // Triangular bullet
    array('...', '...', 'hellip', 8230, 'x2026'), // Horizontal ellipsis
    array('°', 'deg', 176, 'xB0'), // Degree
    array('EUR', 'euro', 8364, 'x20AC'), // Euro
    array('￥', 'yen', 165, 'xA5'), // Yen
    array('￡', 'pound', 163, 'xA3'), // British Pound
    array('?', 'copy', 169, 'xA9'), // Copyright Sign
    array('?', 'reg', 174, 'xAE'), // Registered Sign
    array('(TM)', 'trade', 8482, 'x2122') // TM Sign
    );
    foreach ($map as $e) {
    for ($i = 1; $i < count($e); ++$i) {
    $code = $e[$i];
    if (is_int($code)) {
    // numeric entity
    $regex = "/&(amp;)?#0*$code;/";
    }
    elseif (preg_match('/^.$/u', $code)/* one unicode char*/) {
    // single character
    $regex = "/$code/u";
    }
    elseif (preg_match('/^x([0-9A-F]{2}){1,2}$/i', $code)) {
    // hex entity
    $regex = "/&(amp;)?#x0*" . substr($code, 1) . ";/i";
    }
    else {
    // named entity
    $regex = "/&(amp;)?$code;/";
    }
    $find[] = $regex;
    $repl[] = $e[0];
    }
    }
    } // end first time build
    return preg_replace($find, $repl, $text);
    }

Convert a PDF to text with Perl

This is the only exception in our list all other snippets are based on PHP, but this short script is written in Perl and simply converts the PDF 'demo.pdf' to plain text.
   

        #!/perl/bin/perl -w
    use CAM::PDF;
    use CAM::PDF::PageText;

    $filename = "demo.pdf";

    my $pdf = CAM::PDF->new($filename);
    my $pageone_tree = $pdf->getPageContentTree(4);
    print CAM::PDF::PageText->render($pageone_tree);

    #Note: I had to install CAM::PDF::PageText by hand, it was not installed by CPAN when I installed CAM::PDF.

I hope you will find the above snippets useful. I wanted to include DOC to PDF converter too, though PHP isn't much of  help in this case, however, I found few links that might be useful that can convert different file formats.

Converting documents (ODT, DOC to PDF) on PHP with Unoconv

I found this accidentally, though you need Unoconv installed. Python tool that utilizes LibreOffice libs (pyuno).

Here is the link to guide installation and usage:

http://tech.rgou.net/en/php/converting-documents-odt-doc-to-pdf-on-php-with-unoconv-libreoffice/

 Using LiveDocx with PHP 4 and PHP 5 NuSOAP

And another use of LiveDocx without need of Zend Framework, but but does require the SOAP library NuSOAP.

Here is link to guide: http://www.phplivedocx.org/articles/using-livedocx-with-nusoap/