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April 17, 2017 19:59
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Save gambolputty/db427d24341f61040bdde1c74a56e1ad to your computer and use it in GitHub Desktop.
Create custom post & pages output for facebook- & twitter crawlers. Useful for single page application themes built with VueJS oder Angular (facebook crawler doesn't read JavaScript)
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| function wp_crawler_version() { | |
| if ( !is_admin() ) { | |
| if ( is_home() ) { | |
| return; | |
| } | |
| /* | |
| Get user agent | |
| */ | |
| if ( !isset($_SERVER["HTTP_USER_AGENT"]) ) | |
| return; | |
| $agent = $_SERVER["HTTP_USER_AGENT"]; | |
| // detect fb crawler: https://developers.facebook.com/docs/sharing/webmasters/crawler | |
| if ( preg_match("/^facebookexternalhit\/1\.1|^facebot|^twitterbot/i", $agent) ) { | |
| if ( is_page() || is_single() ) { | |
| global $post; | |
| $result = []; | |
| $result['title'] = $post->post_title; | |
| $result['excerpt'] = my_excerpt($post->content, $post->post_excerpt); | |
| $result['url'] = $post->guid; | |
| // Advanced Custom Fields plugin | |
| $img_field = get_field('small_img', $post->ID); | |
| if (!empty($img_field)) { | |
| $result['img'] = $img_field['url']; | |
| } | |
| ?> | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title><?php bloginfo('name'); ?> | <?php echo $result['title']; ?></title> | |
| <meta name="description" content="<?php echo $result['excerpt']; ?>"> | |
| <meta property="og:title" content="<?php echo $result['title']; ?>" /> | |
| <meta property="og:type" content="article" /> | |
| <meta property="og:url" content="<?php echo $result['url']; ?>" /> | |
| <meta property="og:description" content="<?php echo $result['excerpt']; ?>" /> | |
| <meta property="og:site_name" content="<?php bloginfo('name'); ?>" /> | |
| <?php if (isset($result['img'])): ?> | |
| <meta property="og:image" content="<?php echo $result['img']; ?>" /> | |
| <?php else: ?> | |
| <meta property="og:image" content="<?php echo get_template_directory_uri(); ?>/img/fb_image.png" /> | |
| <?php endif; ?> | |
| </head> | |
| <body></body> | |
| </html> | |
| <?php | |
| exit; | |
| } | |
| } | |
| } | |
| } | |
| add_action( 'wp', 'wp_crawler_version' ); | |
| function my_excerpt($text, $excerpt){ | |
| /* | |
| Derived from Wordpress version 3.0.4 | |
| */ | |
| if ($excerpt) return $excerpt; | |
| $text = strip_shortcodes( $text ); | |
| $text = apply_filters('the_content', $text); | |
| $text = str_replace(']]>', ']]>', $text); | |
| $text = strip_tags($text); | |
| $text = str_replace("\"", "'", $text); | |
| $excerpt_length = apply_filters('excerpt_length', 55); | |
| $excerpt_more = apply_filters('excerpt_more', ' ' . '[...]'); | |
| $words = preg_split("/[\n | |
| ]+/", $text, $excerpt_length + 1, PREG_SPLIT_NO_EMPTY); | |
| if ( count($words) > $excerpt_length ) { | |
| array_pop($words); | |
| $text = implode(' ', $words); | |
| $text = $text . $excerpt_more; | |
| } else { | |
| $text = implode(' ', $words); | |
| } | |
| return apply_filters('wp_trim_excerpt', $text, $excerpt); | |
| } |
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