[Solved] Search PDF by content in Real3D FlipBook Plugin

[EpsilonAdmin]

Recently we faced a great plugin to display PDF files in a fancy way - like a paper magazine! It's the Real3D Flipbook plugin, which is awesome! However it also has the same problem - users are not possible to search PDF documents uploaded to the Real3D FlipBook by the content.

Fortunately, it is also simple to fix with the WPFTS Pro.

add_filter('wpfts_index_post', function($index, $p)
{
        global $wpdb, $wpfts_core;
        
        if (in_array($p->post_type, array('post', 'page'))) {
                global $post;
                
                if (preg_match_all('~[real3dflipbook((\s+[^]]*)|(]))]~sU', $p->post_content, $zz, PREG_OFFSET_CAPTURE)) {
					// 1 is a shortcode params
					// 0 is a whole shortcode tag
					require_once $wpfts_core->root_dir.'/includes/wpfts_utils.class.php';

					$sum = '';

					foreach ($zz[1] as $k => $d) {
					
						if (isset($d[0])) {
							$zz2 = array();
							if (preg_match('~id=[\x22\x27]?(\d+)~', $d[0], $zz2)) {

								$bookid = $zz2[1];

								// Look for data
								$ff = get_option('real3dflipbook_'.$bookid);
								if ($ff && (is_array($ff))) {

									if (isset($ff['pdfUrl'])) {

										$url = trim($ff['pdfUrl']);

										if (strlen($url) > 0) {
											$ret = WPFTS_Utils::GetCachedFileContent_ByLocalLink($url);

											$sum .= (isset($ret['post_content']) ? trim($ret['post_content']) : '').' ';	
										}
									}
								}
							}
						}
					
					}

					$index['real3dflipbook_content'] .= $sum;

					/*
					$content = $p->post_content;
					// Remove the pdfviewer shortcodes

					for ($ii = count($zz[0]) - 1; $ii >= 0; $ii --) {
						$content = substr($content, 0, $zz[0][$ii][1]).substr($content, $zz[0][$ii][1] + strlen($zz[0][$ii][0]));
					}

					$index['post_content'] = $content;
					*/
	
					global $shortcode_tags;

					$removed_tmp = array();
					
					$shortcode_list = array('real3dflipbook');

					foreach ($shortcode_list as $dd) {
						if (isset($shortcode_tags[$dd])) {
							$removed_tmp[$dd] = $shortcode_tags[$dd];	// Save shortcode function
							unset($shortcode_tags[$dd]);
						} else {
							$removed_tmp[$dd] = false;
						}
						add_shortcode($dd, function(){ return ''; });	// Dummy function to render empty string for shortcode
					}

					$post = get_post($p->ID);
					setup_postdata($post);
                
					ob_start();
					the_content();
                
					$r = ob_get_clean();
					$r = strip_tags(str_replace('<', ' <', $r));
				
					// Okay, we need to restore shortcodes
					foreach ($removed_tmp as $k => $d) {
						if ($d) {
							$shortcode_tags[$k] = $removed_tmp[$k];
						} else {
							unset($shortcode_tags[$k]);
						}
					}

					wp_reset_postdata();
                
					$index['post_content'] = $r;
				}
		}
        
        return $index;
}, 3, 2);

Well, the code is not that simple, but if you just want to have it works,
download the ready addon!

https://fulltextsearch.org/wpfts-addon-real3dflipbook-1.0.0.zip