The following script will automatically set the first image in a WordPress post as the Featured Image when the post is saved. You can override the functionality by selecting a Featured Image.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 | /** * Transition post status action. * * @param string $new_status * @param string $old_status * @param WP_Post $post * @return void */ add_action('transition_post_status', function (string $new_status, string $old_status, WP_Post $post): void { if (defined('REST_REQUEST') && REST_REQUEST) { $published_post = $post; /** * REST requests need to postpone changes until "rest_after_insert_{$post->post_type}". * * @param WP_Post $post * @param WP_REST_Request $request * @param bool $creating * @return void */ add_action("rest_after_insert_{$post->post_type}", function ( WP_Post $post, WP_REST_Request $request, bool $creating ) use ( $new_status, $old_status, $published_post ): void { if ($published_post->ID !== $post->ID) { return; } tsg_transition_post_status($new_status, $old_status, $post); }, 10, 3); } else { tsg_transition_post_status($new_status, $old_status, $post); } }, 10, 3); /** * Transition post status function. * * @param string $new_status * @param string $old_status * @param WP_Post $post * @return void */ function tsg_transition_post_status(string $new_status, string $old_status, WP_Post $post): void { // Set the first image in post_content as the Featured Image. If one wasn't set. tsg_set_featured_image($post); } /** * Set the Featured Image automatically. * * @param WP_Post $post * @return void */ function tsg_set_featured_image(WP_Post $post): void { if (!in_array($post->post_type, [ 'post' ])) { return; } // Bypass automatic featured image if the post thumbnail was set manually. if (has_post_thumbnail($post)) { return; } $attachment_ids = tsg_get_image_attachment_ids_from_post_content( $post, [ 'get_first_attachment_id' => true, 'check_aspect_ratio' => true ] ); if (!empty($attachment_ids[ 0 ])) { update_post_meta($post->ID, '_thumbnail_id', $attachment_ids[ 0 ]); } } /** * Get image attachment ids from post content. * * @param WP_Post $post * @param array $args * @return array */ function tsg_get_image_attachment_ids_from_post_content(WP_Post $post, array $args = []): array { $args = array_merge([ 'get_first_attachment_id' => false, 'check_aspect_ratio' => false, 'horizontal_aspect_ratio' => 2.5, 'vertical_aspect_ratio' => 2.5 ], $args); $attachment_ids = []; $images = tsg_get_images_from_post_content($post); if (empty($images)) { return $attachment_ids; } $site_url = parse_url(site_url()); foreach ($images as $image) { // If the image is NOT from the current site, skip it. if (strpos($image[ 'src' ], $site_url[ 'host' ] . '/' . explode('/', $image[ 'src' ])[ 3 ]) === false) { continue; } $guid = tsg_get_original_image_src($image[ 'src' ]); if (empty($guid)) { continue; } $attachment_id = tsg_get_post_id_by_guid($guid); if (empty($attachment_id)) { continue; } if ($args[ 'check_aspect_ratio' ]) { $attachment_metadata = get_metadata('post', $attachment_id, '_wp_attachment_metadata', true); if ( !tsg_check_image_aspect_ratio( $attachment_metadata, $args[ 'horizontal_aspect_ratio' ], $args[ 'vertical_aspect_ratio' ] ) ) { continue; } } $attachment_ids[] = $attachment_id; if ($args[ 'get_first_attachment_id' ]) { break; } } return $attachment_ids; } /** * Get the original image source, size 'full'. * * @param string $url * @param array $args * @return string */ function tsg_get_original_image_src(string $url, array $args = []): string { if (!$url) { return $url; } $args = array_merge([ 'check_exists' => false, 'check_filesize' => false, 'filesize_limit' => 4000000, 'strip_edit' => false ], $args); // Strip the thumbnail size at the end of the URL so that we end up with what // potentially could be the full size original image source. // // There is an edge case where the original URL has dimensions in the filename // with the same format. These will be skipped, this is unaviodable, particularly // for an offsite URL. $url = preg_replace("/\-\d{2,4}[xX]\d{2,4}(\.[a-zA-Z]{2,4})$/", '$1', $url); // Strip the edit timestamp for WordPress edited images. // Turns out this isn't the best idea, end up with unedited images. But can be used for some things. if (!empty($args[ 'strip_edit' ])) { if (strpos($url, '-e') !== false) { $pathinfo = pathinfo($url); if ( !empty($pathinfo[ 'dirname' ]) && !empty($pathinfo[ 'filename' ]) && !empty($pathinfo[ 'extension' ]) ) { $filename_split = array_reverse(explode('-e', $pathinfo[ 'filename' ])); if (!empty($filename_split[ 0 ]) && is_int((int)$filename_split[ 0 ])) { unset($filename_split[ 0 ]); } $url = $pathinfo[ 'dirname' ] . '/' . implode('-e', array_reverse($filename_split)) . '.' . $pathinfo [ 'extension' ]; } } } // Because we've chopped the URL up so much, we may want to check if the image even exists. if (!empty($args[ 'check_exists' ]) || !empty($args[ 'check_filesize' ])) { $stream_options = [ 'http' => [ 'user_agent' => "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6" ], // 'ssl' => [ // 'verify_peer' => false, // 'verify_peer_name' => false // ] ]; $stream_context = stream_context_create($stream_options); $headers = @get_headers($url, true, $stream_context); if (!empty($args[ 'check_exists' ])) { if (empty($headers[ 0 ]) || strpos($headers[ 0 ], '404') !== false) { $url = ''; } } if ($url && !empty($args[ 'check_filesize' ]) && !empty($args[ 'filesize_limit' ])) { if ( empty($headers[ 'Content-Length' ]) || (int)$headers[ 'Content-Length' ] > (int)$args[ 'filesize_limit' ] ) { $url = ''; } } } return $url; } /** * Get all images from the post content. * * @param WP_Post $post * @return array */ function tsg_get_images_from_post_content(WP_Post $post): array { $images = []; if (empty($post->post_content)) { return $images; } $content = apply_filters('the_content', $post->post_content); preg_match_all('/<img\b[^>]+src=[\'"]([^\'"]+\.(?:jpg|png|jpeg))[\'"][^>]*>/i', $content, $matchesImages); if (!empty($matchesImages[ 0 ])) { foreach ($matchesImages[ 0 ] as $key => $img) { $images[ $key ][ 'img' ] = $img; $images[ $key ][ 'src' ] = $matchesImages[ 1 ][ $key ]; preg_match_all( '/(<img\b|(?!^)\G)[^>]*?\b(alt|width|height|srcset|sizes)=([\'"]?)([^>]*?)\3/i', $img, $matchesAttr ); if (!empty($matchesAttr[ 2 ])) { foreach ($matchesAttr[ 2 ] as $attr_key => $attr) { if (!empty($matchesAttr[ 4 ][ $attr_key ])) { $images[ $key ][ $attr ] = $matchesAttr[ 4 ][ $attr_key ]; } } } } } $images = apply_filters('tsg_get_images_from_post_content', $images, $post); return $images; } /** * Get check if an image fits within a suitable aspect ratio. * * @param array $image [ 'height' => int, 'width' => int ] * @param float $horizontal_aspect_ratio * @param float $vertical_aspect_ratio * @return bool */ function tsg_check_image_aspect_ratio( array $image, float $horizontal_aspect_ratio = 2.5, float $vertical_aspect_ratio = 2.5 ): bool { if (empty($image[ 'width' ]) || empty($image[ 'height' ])) { return false; } $calculated_horizontal_aspect_ratio = (int)$image[ 'width' ] / (int)$image[ 'height' ]; $calculated_vertical_aspect_ratio = (int)$image[ 'height' ] / (int)$image[ 'width' ]; if ( $calculated_horizontal_aspect_ratio > $horizontal_aspect_ratio || $calculated_vertical_aspect_ratio > $vertical_aspect_ratio ) { return false; } return true; } /** * Get post ID by guid. * * @param string $guid * @return int ID if found, 0 if not */ function tsg_get_post_id_by_guid(string $guid): int { global $wpdb; $post_id = $wpdb->get_var( $wpdb->prepare(" SELECT ID FROM $wpdb->posts WHERE instr( guid, '%s' ) > 0 ", $guid) ); return intval($post_id); } |