Dynamic fields not rendering in PDF (DOMPDF) - php

Question

I had this very same problem when using Javascript to render data in the HTML and the fields were not showing up in the PDF export. I then scrapped the JS and implemented the data rendering in PHP which works fine but leads to the same outcome. Problem is that when the PDF of the HTML is rendered using DOMPDF library these fields aren't rendered/don't have values. I have tried multiple changes to the code but none have worked yet and I can't seem to find a similar problem online. I don't know if there is anything fundamental that I am missing or not thinking of since I am not very familiar with PHP / DOMPDF. Any insight would be appreciated. [Worpress site with plugin wp-pdf-templates using DOMPDF].
WP PDF Templates Config
<?php
/**
* Plugin Name: WordPress PDF Templates
* Plugin URI: https://github.com/anttiviljami/wp-pdf-templates
* Description: This plugin utilises the DOMPDF Library to provide a URL endpoint e.g. /my-post/pdf/ that generates a downloadable PDF file.
* Version: 1.4.3
* Author: #anttiviljami
* Author URI: https://github.com/anttiviljami
* License: GPLv3
*/
/**
* Copyright 2015-2016 Antti Kuosmanen
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 3, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* WordPress PDF Templates
*
* This plugin utilises the DOMPDF Library to provide a simple URL endpoint
* e.g. http://my-site.com/my-post/pdf/ that generates a downloadable PDF file.
*
* If pretty permalinks are disabled. GET parameters (e.g. ?p=1&pdf) can be used
* instead.
*
* The PDF output can be customized by copying the index-pdf.php file from
* the plugin directory to your theme and creating your own custom template for
* PDF prints.
*
* Stylesheets used on the site are disabled by default, but you can define your
* own stylesheets within the pdf-template.php file. PDF Templates can be
* previewed as raw HTML at the /pdf-preview URL endpoint.
*
* For further information see readme.txt
*/
/**
* Track plugin version number
*/
define('WP_PDF_TEMPLATES_VERSION', '1.4.1');
/**
* Option to disable PDF caching
*
* This can be used for rapidly changing content that's uncacheable, such as
* dynamically generated feeds or user-tailored views.
*/
define('DISABLE_PDF_CACHE', true);
/**
* Option to enable cookies on fetching the PDF template HTML.
*
* This might be useful if the content or access to it depends on browser
* cookies. A possible use scenario for this could be when a login
* authentification is required to access the content.
*/
//define('FETCH_COOKIES_ENABLED', true);
/**
* Set PDF file cache directory
*/
$upload_dir = wp_upload_dir();
if (!defined('PDF_CACHE_DIRECTORY')) {
define('PDF_CACHE_DIRECTORY', $upload_dir['basedir'] . '/pdf-cache/');
}
/**
* Allow remote assets in docs
*/
if (!defined('DOMPDF_ENABLE_REMOTE'))
define('DOMPDF_ENABLE_REMOTE', true);
/**
* Allow remote assets in docs
*/
if (!defined('DOMPDF_ENABLE_HTML5'))
define('DOMPDF_ENABLE_HTML5', true);
/**
* Redefine font directories
*/
if (!defined('DOMPDF_FONT_DIR'))
define('DOMPDF_FONT_DIR', $upload_dir['basedir'] . '/dompdf-fonts/');
if (!defined('DOMPDF_FONT_CACHE'))
define('DOMPDF_FONT_CACHE', $upload_dir['basedir'] . '/dompdf-fonts/');
/**
* This function can be used to set PDF print support for custom post types.
* Takes an array of post types (strings) as input. See defaults below.
*/
function set_pdf_print_support($post_types) {
global $pdf_post_types;
if(is_array($post_types)) {
$pdf_post_types = $post_types;
}
else {
trigger_error('Must supply array as parameter.');
}
}
/**
* Default post types supported are post and page
*/
set_pdf_print_support(array('post', 'page'));
/**
* Adds rewrite rules for printing if using pretty permalinks
*/
add_action('init', '_pdf_rewrite');
function _pdf_rewrite() {
add_rewrite_endpoint('pdf', EP_ALL);
add_rewrite_endpoint('pdf-preview', EP_ALL);
add_rewrite_endpoint('pdf-template', EP_ALL);
}
/**
* Registers print endpoints
*/
add_filter('query_vars', '_get_pdf_query_vars');
function _get_pdf_query_vars($query_vars) {
$query_vars[] = 'pdf';
$query_vars[] = 'pdf-preview';
$query_vars[] = 'pdf-template';
return $query_vars;
}
/**
* Flushes the rewrite rules on plugin activation and deactivation
*/
register_activation_hook(__FILE__, '_flush_pdf_rewrite_rules');
register_deactivation_hook(__FILE__, '_flush_pdf_rewrite_rules');
function _flush_pdf_rewrite_rules() {
// flush rewrite rules
// NOTE: You can also do this by going to Settings > Permalinks and hitting the save button
global $wp_rewrite;
_pdf_rewrite();
$wp_rewrite->flush_rules(false);
}
/**
* Creates a directory for any new fonts the user may upload
*/
register_activation_hook(__FILE__, '_init_dompdf_fonts');
function _init_dompdf_fonts() {
// copy DOMPDF fonts to wp-content/dompdf-fonts/
require_once "vendor/autoload.php";
if(!is_dir(DOMPDF_FONT_DIR)) {
#mkdir(DOMPDF_FONT_DIR);
}
if(!file_exists(DOMPDF_FONT_DIR . '/dompdf_font_family_cache.dist.php')) {
copy(
dirname(__FILE__) . 'vendor/dompdf/dompdf/lib/fonts/dompdf_font_family_cache.dist.php',
DOMPDF_FONT_DIR . '/dompdf_font_family_cache.dist.php'
);
}
}
/**
* Applies print templates
*/
add_action('template_redirect', '_use_pdf_template');
function _use_pdf_template() {
global $wp_query, $pdf_post_types;
if(in_array(get_post_type(), $pdf_post_types)) {
if (isset($wp_query->query_vars['pdf-template'])) {
// Substitute the PDF printing template
// disable scripts and stylesheets
// NOTE: We do this because in most cases the stylesheets used on the site
// won't automatically work with the DOMPDF Library. This way you have to
// define your own PDF styles using <style> tags in the template.
add_action('wp_print_styles', '_remove_dep_arrays', ~PHP_INT_MAX);
add_action('wp_print_scripts', '_remove_dep_arrays', ~PHP_INT_MAX);
add_action('wp_print_footer_scripts', '_remove_dep_arrays', ~PHP_INT_MAX);
// disable the wp admin bar
add_filter('show_admin_bar', '__return_false');
remove_action('wp_head', '_admin_bar_bump_cb');
// use the print template
add_filter('template_include', '_locate_pdf_template');
}
// our post permalink
$url = parse_url(get_the_permalink());
// we use localhost to make sure we're requesting the page from this wordpress instance
$link = $url['scheme'] . '://localhost' . $url['path'];
$link = $link . (strpos($link, '?') === false ? '?' : '&') . 'pdf-template';
if(isset($wp_query->query_vars['pdf']) || isset($wp_query->query_vars['pdf-preview'])) {
// we want a html template
$header = 'Accept:text/html' . "\n";
// since we're always requesting this from localhost, we need to set the Host
// header for WordPress to route our request correctly
$header = 'Host:' . $url['host'] . "\n";
if( defined('FETCH_COOKIES_ENABLED') && FETCH_COOKIES_ENABLED ) {
// pass cookies from current request
if( isset( $_SERVER['HTTP_COOKIE'] ) ) {
$header .= 'Cookie: ' . $_SERVER['HTTP_COOKIE'] . "\n";
}
}
// create a request context for file_get_contents
$context = stream_context_create(array(
'http' => array(
'method' => 'GET',
'header' => $header,
),
'ssl' => array(
'verify_peer' => false, // since we're using localhost, HTTPS doesn't need peer verification
'verify_peer_name' => false,
),
));
// load the generated html from the template endpoint
$html = file_get_contents( $link, false, $context );
if( empty( $html ) ) {
// sometimes the ssl module just fails, fall back to http insted
$html = file_get_contents( str_ireplace( 'https://', 'http://', $link ), false, $context );
}
if( empty( $html ) ) {
// if all else fails, try the public site url (not localhost)
$link = get_the_permalink();
$link = $link . (strpos($link, '?') === false ? '?' : '&') . 'pdf-template';
$html = file_get_contents( $link , false, $context );
}
// process the html output
$html = apply_filters('pdf_template_html', $html);
// pass for printing
_print_pdf($html);
}
}
}
/**
* Locates the theme pdf template file to be used
*/
function _locate_pdf_template($template) {
// locate proper template file
// NOTE: this only works if the standard template file exists as well
// i.e. to use single-product-pdf.php you must also have single-product.php
// #TODO: Utilise a template wrapper like this one: https://roots.io/sage/docs/theme-wrapper/
$pdf_template = str_replace('.php', '-pdf.php', basename($template));
if(file_exists(get_stylesheet_directory() . '/' . $pdf_template)) {
$template_path = get_stylesheet_directory() . '/' . $pdf_template;
}
else if(file_exists(get_template_directory() . '/' . $pdf_template)) {
$template_path = get_template_directory() . '/' . $pdf_template;
}
else if(file_exists(plugin_dir_path(__FILE__) . $pdf_template)) {
$template_path = plugin_dir_path(__FILE__) . $pdf_template;
}
else if(file_exists(get_stylesheet_directory() . '/' . 'index-pdf.php')) {
$template_path = get_stylesheet_directory() . '/' . 'index-pdf.php';
}
else if(file_exists(get_template_directory() . '/' . 'index-pdf.php')) {
$template_path = get_template_directory() . '/' . 'index-pdf.php';
}
else {
$template_path = plugin_dir_path(__FILE__) . 'index-pdf.php';
}
return $template_path;
}
/**
* Removes all scripts and stylesheets
*/
function _remove_dep_arrays() {
global $wp_scripts, $wp_styles;
$wp_scripts = $wp_styles = array();
}
/**
* Filters the html generated from the template for printing
*/
add_filter('pdf_template_html', '_process_pdf_template_html');
function _process_pdf_template_html($html) {
// relative to absolute links
$html = preg_replace('/src\s*=\s*"\//', 'src="' . home_url('/'), $html);
$html = preg_replace('/src\s*=\s*\'\//', "src='" . home_url('/'), $html);
return $html;
}
/**
* Handles the PDF Conversion
*/
function _print_pdf($html) {
global $wp_query;
if (isset($wp_query->query_vars['pdf'])) {
// convert to PDF
$filename = sanitize_file_name(get_the_title());
$cache_id = substr(md5(get_the_modified_time()), -6);
$filename = apply_filters('pdf_template_filename', $filename);
$cache_id = apply_filters('pdf_template_cache_id', $cache_id);
$cached = PDF_CACHE_DIRECTORY . $filename . '-' . $cache_id . '.pdf';
$filename .= '.pdf';
// check if we need to generate PDF against cache
if(( defined('DISABLE_PDF_CACHE') && DISABLE_PDF_CACHE ) || ( isset($_SERVER['HTTP_PRAGMA']) && $_SERVER['HTTP_PRAGMA'] == 'no-cache' ) || !file_exists($cached) ) {
// we may need more than 30 seconds execution time
//set_time_limit(60);
// include the library
require_once 'vendor/autoload.php';
// html to pdf conversion
$dompdf = new Dompdf\Dompdf();
$dompdf->setPaper(
defined('DOMPDF_PAPER_SIZE') ? DOMPDF_PAPER_SIZE : DOMPDF_DEFAULT_PAPER_SIZE,
defined('DOMPDF_PAPER_ORIENTATION') ? DOMPDF_PAPER_ORIENTATION : 'portrait');
$options = $dompdf->getOptions();
$options->set(array(
'fontDir' => DOMPDF_FONT_DIR,
'fontCache' => DOMPDF_FONT_CACHE,
'isHtml5ParserEnabled' => DOMPDF_ENABLE_HTML5,
'isRemoteEnabled' => DOMPDF_ENABLE_REMOTE,
));
// allow setting a different DPI value
if( defined('DOMPDF_DPI') ) $options->set(array('dpi' => DOMPDF_DPI));
$dompdf->setOptions($options);
// allow other plugins to filter the html before passing it to dompdf
$html = apply_filters('pdf_html_to_dompdf', $html);
$dompdf->loadHtml($html);
//$dompdf->setBasePath(get_stylesheet_directory_uri());
$dompdf->render();
if(defined('DISABLE_PDF_CACHE') && DISABLE_PDF_CACHE) {
//just stream the PDF to user if caches are disabled
return $dompdf->stream($filename, array("Attachment" => false));
}
// create PDF cache if one doesn't yet exist
if(!is_dir(PDF_CACHE_DIRECTORY)) {
#mkdir(PDF_CACHE_DIRECTORY);
}
//save the pdf file to cache
file_put_contents($cached, $dompdf->output());
}
//read and display the cached file
header('Content-type: application/pdf');
header('Content-Disposition: inline; filename="' . $filename . '"');
header('Content-Transfer-Encoding: binary');
header('Content-Length: ' . filesize($cached));
header('Accept-Ranges: bytes');
readfile($cached);
}
else {
// print the HTML raw
echo $html;
}
// kill php after output is complete
die();
}
Page Template:
**SOME CONTENT OMITTED**
<?php
$cookie_name = "userScore";
$userScoreCookie = $_COOKIE[$cookie_name];
if(isset($userScoreCookie)) {
// ENCODE
$encodedArray = json_encode($userScoreCookie, true);
// DECODE
$decodedArray = json_decode($encodedArray, true);
// GET NUMBERS FROM OUTPUT
$int_var = preg_replace('/[^0-9]/', '', $decodedArray);
// CONVERT TO INTEGERS
$int_var_sanitize = (int)filter_var($int_var, FILTER_SANITIZE_NUMBER_INT);
$testarray = str_split((string)$int_var_sanitize);
// Filter answers
$count = 0;
foreach($testarray as $value) {
if($value == 1) {
if($count == 0) {
$exportAnswer1 = 'STRONGLY DISAGREE';
} else if($count == 1) {
$exportAnswer2 = 'STRONGLY DISAGREE';
} else if($count == 2) {
$exportAnswer3 = 'STRONGLY DISAGREE';
} else if($count == 3) {
$exportAnswer4 = 'STRONGLY DISAGREE';
} else if($count == 4) {
$exportAnswer5 = 'STRONGLY DISAGREE';
}
$count++;
} else if($value == 2) {
if($count == 0) {
$exportAnswer1 = 'DISAGREE';
} else if($count == 1) {
$exportAnswer2 = 'DISAGREE';
} else if($count == 2) {
$exportAnswer3 = 'DISAGREE';
} else if($count == 3) {
$exportAnswer4 = 'DISAGREE';
} else if($count == 4) {
$exportAnswer5 = 'DISAGREE';
}
$count++;
} else if($value == 3) {
if($count == 0) {
$exportAnswer1 = 'UNCERTAIN';
} else if($count == 1) {
$exportAnswer2 = 'UNCERTAIN';
} else if($count == 2) {
$exportAnswer3 = 'UNCERTAIN';
} else if($count == 3) {
$exportAnswer4 = 'UNCERTAIN';
} else if($count == 4) {
$exportAnswer5 = 'UNCERTAIN';
}
$count++;
} else if($value == 4) {
if($count == 0) {
$exportAnswer1 = 'AGREE';
} else if($count == 1) {
$exportAnswer2 = 'AGREE';
} else if($count == 2) {
$exportAnswer3 = 'AGREE';
} else if($count == 3) {
$exportAnswer4 = 'AGREE';
} else if($count == 4) {
$exportAnswer5 = 'AGREE';
}
$count++;
} else if($value == 5) {
if($count == 0) {
$exportAnswer1 = 'STRONGLY AGREE';
} else if($count == 1) {
$exportAnswer2 = 'STRONGLY AGREE';
} else if($count == 2) {
$exportAnswer3 = 'STRONGLY AGREE';
} else if($count == 3) {
$exportAnswer4 = 'STRONGLY AGREE';
} else if($count == 4) {
$exportAnswer5 = 'STRONGLY AGREE';
}
$count++;
}
}
}
?>
<!-- Input answers -->
<div class="answer" id="export-answer-1"><?php echo $exportAnswer1 ?></div>
<div class="answer" id="export-answer-2"><?php echo $exportAnswer2 ?></div>
<div class="answer" id="export-answer-3"><?php echo $exportAnswer3 ?></div>
<div class="answer" id="export-answer-4"><?php echo $exportAnswer4 ?></div>
<div class="answer" id="export-answer-5"><?php echo $exportAnswer5 ?></div>
**SOME CONTENT OMITTED**
Rendered HTML
<div id="page-wrap" class="container">
<div id="content">
<div id="exportContent">
<div class="container">
<div class="center section-break m-container">
<div class="divider"></div>
<div class="qna-container">
<div class="question">
<span class="blue-text bold mr-5">1.</span> Using my Blue Inhaler Reliever to treat symptoms is the best way to keep on top of my asthma
</div>
<div class="answer" id="export-answer-1">DISAGREE</div>
</div>
<div class="divider"></div>
<div class="qna-container">
<div class="question">
<span class="blue-text bold mr-5">2.</span> I don’t worry about asthma when I have my Blue Reliever Inhaler around
</div>
<div class="answer" id="export-answer-2">UNCERTAIN</div>
</div>
<div class="divider"></div>
<div class="qna-container">
<div class="question">
<span class="blue-text bold mr-5">3.</span> My Blue Reliever Inhaler is the only asthma treatment I can really rely on
</div>
<div class="answer" id="export-answer-3">AGREE</div>
</div>
<div class="divider"></div>
<div class="qna-container">
<div class="question">
<span class="blue-text bold mr-5">4.</span> The benefits of using my Blue Reliever Inhaler easily outweigh any risks
</div>
<div class="answer" id="export-answer-4">UNCERTAIN</div>
</div>
<div class="divider"></div>
<div class="qna-container">
<div class="question">
<span class="blue-text bold mr-5">5.</span> I prefer to rely on my Blue Reliever Inhaler rather than my Steroid Preventer Inhaler
</div>
<div class="answer" id="export-answer-5">DISAGREE</div>
</div>
</div>
</div>
</div>
</div>
</div>