Simple PDF Exporter

In order to export a pdf, you can do it from backend from Tools -> PDF Export or enter http://yoursite.com/?export=pdf in your browser.
You can also make the url into a link or button on your site, to use on frontend.

You can add a frontend link or button on your frontend and customize it, like in this example for Twitter Bootstrap:
Change the parameters to suit your needs.

<?php // Check if PDF Export Plugin exists first
if( function_exists('simple_pdf_export_process')) { ?>
    <ul class="nav nav-tabs pull-right pdf_export_menu">
        <li role="presentation" class="dropdown">
        <a class="dropdown-toggle btn" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">Export Posts to PDF <span class="caret"></span></a>
            <ul class="dropdown-menu">
                <?php
                    $post_type_to_export = 'portfolio';
                    $final_pdf = SIMPLE_PDF_EXPORTER_EXPORT.$post_type_to_export.SIMPLE_PDF_EXPORTER_EXTRA_FILE_NAME.date('dMY').'.pdf';
                    if(file_exists($final_pdf)) {
                        $file_date = date("d M Y - H:i", filemtime($final_pdf));
                        ?>
                        <li><a class="" href="?export=pdf&post_type=portfolio&num=3" target="_blank">Download Existing Version <small>(<?php echo $file_date; ?> GMT)</small></a></li>
                <?php } ?>
                <li><a class="" href="?export=pdf&post_type=portfolio&num=3&force" target="_blank">Generate New Version <small>(might take several minutes)</small></a></li>
            </ul>
        </li>
    </ul>
<?php } ?>

Use &num=x in your url.
eg. http://yoursite.com/?export=pdf&num=3

Use &post_id=x with the ID of the post or custom post type you need, in your url.
eg. http://yoursite.com/?export=pdf&post_id=3
In this case, don’t use the post_type parameter. The num parameter will be ignored for obvious reasons.

Use &post_type=x.
eg. http://yoursite.com/?export=pdf&post_type=your-post-type-slug

You need to change the file pdf_layout.php inside the plugin folder wp-content/plugins/simple-pdf-exporter/process/pdf_layout.php
Your layout must be echoed in php. eg. echo '<div>the content goes here</div>'; or it won’t show up in the PDF.

Use &force after your url
eg. http://yoursite.com/?export=pdf&force
This will also invalidate the internal cache, hence it will take more time to generate the PDF. Avoid if possible.

You can use a custom CSS to customize the layout.
Create a file named pdf_export.css in your theme folder, otherwise the plugin’s default (and really basic) CSS will be used (you can find it here wp-content/plugins/simple-pdf-exporter/assets/pdf_export.css)

Yes there’s a few. In order to change them, add them to your wp-config.php file.
eg. define(SIMPLE_PDF_EXPORTER_PAGINATION’, true);

Here’s the full list and what they are set to, by default:

• define(‘SIMPLE_PDF_EXPORTER_DEBUG’, false); // if true, the output will be in html for debugging purposes
• define(‘SIMPLE_PDF_EXPORTER_PAGINATION’, false);
• define(‘SIMPLE_PDF_EXPORTER_HTML_OUTPUT’, false);
• define(SIMPLE_PDF_EXPORTER_CSS_FILE’, get_stylesheet_directory().’/pdf_export.css’);
• define(‘SIMPLE_PDF_EXPORTER_LAYOUT_FILE’, get_stylesheet_directory().’/pdf_layout.php’);
• define(‘SIMPLE_PDF_EXPORTER_EXTRA_FILE_NAME’, ‘-‘);
• define(‘DOMPDF_PAPER_SIZE’, ‘A4’);
• define(‘DOMPDF_PAPER_ORIENTATION’, ‘portrait’);
• define(‘DOMPDF_DPI’, 72);
• define(‘DOMPDF_ENABLE_REMOTE’, true);
• define(‘DOMPDF_ENABLE_HTML5’, true); // true by default, since v.1.9.2
• define(‘DOMPDF_ENABLE_FONTSUBSETTING’, true);
• define(‘DOMPDF_MEDIATYPE’, ‘print’);
• define(‘DOMPDF_FONTHEIGHTRATIO’, 1);

You can set define(‘SIMPLE_PDF_EXPORTER_HTML_OUTPUT’, true); in your wp-config.php file, just remember to comment the line or set to false, when you are done debugging.