| 1 |
<?php |
| 2 |
/** |
| 3 |
* MCP Tools for Bulk Alt Text Operations |
| 4 |
* |
| 5 |
* Provides MCP tools for auditing and bulk editing image alt text. |
| 6 |
* Addresses accessibility and image SEO at scale. |
| 7 |
* |
| 8 |
* @package MetaSync |
| 9 |
* @subpackage MCP_Server/Tools |
| 10 |
* @since 2.8.0 |
| 11 |
*/ |
| 12 |
|
| 13 |
if (!defined('ABSPATH')) { |
| 14 |
exit; |
| 15 |
} |
| 16 |
|
| 17 |
require_once plugin_dir_path(dirname(__FILE__)) . 'class-mcp-tool-base.php'; |
| 18 |
|
| 19 |
/** |
| 20 |
* Audit Alt Text Tool |
| 21 |
* |
| 22 |
* Finds images without alt text or with poor quality alt text |
| 23 |
*/ |
| 24 |
class MCP_Tool_Audit_Alt_Text extends MCP_Tool_Base { |
| 25 |
|
| 26 |
public function get_name() { |
| 27 |
return 'wordpress_audit_alt_text'; |
| 28 |
} |
| 29 |
|
| 30 |
public function get_description() { |
| 31 |
return 'Audit images for missing or poor quality alt text. Returns images that need attention for accessibility and SEO.'; |
| 32 |
} |
| 33 |
|
| 34 |
public function get_input_schema() { |
| 35 |
return [ |
| 36 |
'type' => 'object', |
| 37 |
'properties' => [ |
| 38 |
'status' => [ |
| 39 |
'type' => 'string', |
| 40 |
'enum' => ['missing', 'short', 'long', 'all'], |
| 41 |
'description' => 'Filter by alt text status: missing (no alt text), short (<10 chars), long (>125 chars), all (return all images)', |
| 42 |
], |
| 43 |
'limit' => [ |
| 44 |
'type' => 'integer', |
| 45 |
'description' => 'Maximum number of images to return (default: 100, max: 500)', |
| 46 |
'minimum' => 1, |
| 47 |
'maximum' => 500, |
| 48 |
], |
| 49 |
'offset' => [ |
| 50 |
'type' => 'integer', |
| 51 |
'description' => 'Number of images to skip (for pagination)', |
| 52 |
'minimum' => 0, |
| 53 |
], |
| 54 |
'mime_type' => [ |
| 55 |
'type' => 'string', |
| 56 |
'description' => 'Filter by MIME type (e.g., "image/jpeg", "image/png")', |
| 57 |
], |
| 58 |
], |
| 59 |
]; |
| 60 |
} |
| 61 |
|
| 62 |
public function execute($params) { |
| 63 |
$this->validate_params($params); |
| 64 |
$this->require_capability('upload_files'); |
| 65 |
|
| 66 |
$status = isset($params['status']) ? sanitize_text_field($params['status']) : 'missing'; |
| 67 |
$limit = isset($params['limit']) ? min(intval($params['limit']), 500) : 100; |
| 68 |
$offset = isset($params['offset']) ? intval($params['offset']) : 0; |
| 69 |
$mime_type = isset($params['mime_type']) ? sanitize_text_field($params['mime_type']) : ''; |
| 70 |
|
| 71 |
// Query arguments |
| 72 |
$query_args = [ |
| 73 |
'post_type' => 'attachment', |
| 74 |
'post_status' => 'inherit', |
| 75 |
'posts_per_page' => $limit, |
| 76 |
'offset' => $offset, |
| 77 |
'post_mime_type' => $mime_type ?: 'image', |
| 78 |
]; |
| 79 |
|
| 80 |
$query = new WP_Query($query_args); |
| 81 |
$images = []; |
| 82 |
$counts = [ |
| 83 |
'missing' => 0, |
| 84 |
'short' => 0, |
| 85 |
'long' => 0, |
| 86 |
'good' => 0, |
| 87 |
]; |
| 88 |
|
| 89 |
foreach ($query->posts as $attachment) { |
| 90 |
$alt_text = get_post_meta($attachment->ID, '_wp_attachment_image_alt', true); |
| 91 |
$alt_length = mb_strlen($alt_text); |
| 92 |
|
| 93 |
// Determine status |
| 94 |
$image_status = 'good'; |
| 95 |
if (empty($alt_text)) { |
| 96 |
$image_status = 'missing'; |
| 97 |
$counts['missing']++; |
| 98 |
} elseif ($alt_length < 10) { |
| 99 |
$image_status = 'short'; |
| 100 |
$counts['short']++; |
| 101 |
} elseif ($alt_length > 125) { |
| 102 |
$image_status = 'long'; |
| 103 |
$counts['long']++; |
| 104 |
} else { |
| 105 |
$counts['good']++; |
| 106 |
} |
| 107 |
|
| 108 |
// Filter by requested status |
| 109 |
if ($status !== 'all' && $image_status !== $status) { |
| 110 |
continue; |
| 111 |
} |
| 112 |
|
| 113 |
$metadata = wp_get_attachment_metadata($attachment->ID); |
| 114 |
$file_size = filesize(get_attached_file($attachment->ID)); |
| 115 |
|
| 116 |
$images[] = [ |
| 117 |
'attachment_id' => $attachment->ID, |
| 118 |
'url' => wp_get_attachment_url($attachment->ID), |
| 119 |
'filename' => basename($attachment->guid), |
| 120 |
'title' => $attachment->post_title, |
| 121 |
'alt_text' => $alt_text, |
| 122 |
'alt_length' => $alt_length, |
| 123 |
'status' => $image_status, |
| 124 |
'mime_type' => $attachment->post_mime_type, |
| 125 |
'width' => isset($metadata['width']) ? $metadata['width'] : null, |
| 126 |
'height' => isset($metadata['height']) ? $metadata['height'] : null, |
| 127 |
'file_size' => $file_size, |
| 128 |
'uploaded' => $attachment->post_date, |
| 129 |
]; |
| 130 |
} |
| 131 |
|
| 132 |
// Get total counts |
| 133 |
$total_query = new WP_Query([ |
| 134 |
'post_type' => 'attachment', |
| 135 |
'post_status' => 'inherit', |
| 136 |
'posts_per_page' => -1, |
| 137 |
'post_mime_type' => $mime_type ?: 'image', |
| 138 |
'fields' => 'ids', |
| 139 |
]); |
| 140 |
$total_images = $total_query->found_posts; |
| 141 |
|
| 142 |
return $this->success([ |
| 143 |
'total_images' => $total_images, |
| 144 |
'images_analyzed' => count($query->posts), |
| 145 |
'images_returned' => count($images), |
| 146 |
'counts' => $counts, |
| 147 |
'filter' => $status, |
| 148 |
'images' => $images, |
| 149 |
'recommendations' => $this->get_recommendations($counts, $total_images), |
| 150 |
]); |
| 151 |
} |
| 152 |
|
| 153 |
/** |
| 154 |
* Generate recommendations based on audit results |
| 155 |
*/ |
| 156 |
private function get_recommendations($counts, $total) { |
| 157 |
$recommendations = []; |
| 158 |
|
| 159 |
$missing_pct = ($counts['missing'] / max($total, 1)) * 100; |
| 160 |
$short_pct = ($counts['short'] / max($total, 1)) * 100; |
| 161 |
$long_pct = ($counts['long'] / max($total, 1)) * 100; |
| 162 |
|
| 163 |
if ($missing_pct > 10) { |
| 164 |
$recommendations[] = [ |
| 165 |
'severity' => 'high', |
| 166 |
'issue' => "{$counts['missing']} images ({$missing_pct}%) have no alt text", |
| 167 |
'action' => 'Add descriptive alt text to improve accessibility and SEO', |
| 168 |
]; |
| 169 |
} |
| 170 |
|
| 171 |
if ($short_pct > 5) { |
| 172 |
$recommendations[] = [ |
| 173 |
'severity' => 'medium', |
| 174 |
'issue' => "{$counts['short']} images ({$short_pct}%) have very short alt text (<10 chars)", |
| 175 |
'action' => 'Expand alt text to be more descriptive (10-125 characters recommended)', |
| 176 |
]; |
| 177 |
} |
| 178 |
|
| 179 |
if ($long_pct > 5) { |
| 180 |
$recommendations[] = [ |
| 181 |
'severity' => 'low', |
| 182 |
'issue' => "{$counts['long']} images ({$long_pct}%) have very long alt text (>125 chars)", |
| 183 |
'action' => 'Shorten alt text to improve readability (125 characters max recommended)', |
| 184 |
]; |
| 185 |
} |
| 186 |
|
| 187 |
if (empty($recommendations)) { |
| 188 |
$recommendations[] = [ |
| 189 |
'severity' => 'info', |
| 190 |
'issue' => 'Alt text quality is good', |
| 191 |
'action' => 'Continue maintaining quality alt text for all images', |
| 192 |
]; |
| 193 |
} |
| 194 |
|
| 195 |
return $recommendations; |
| 196 |
} |
| 197 |
} |
| 198 |
|
| 199 |
/** |
| 200 |
* Bulk Update Alt Text Tool |
| 201 |
* |
| 202 |
* Updates alt text for multiple images at once |
| 203 |
*/ |
| 204 |
class MCP_Tool_Bulk_Update_Alt_Text extends MCP_Tool_Base { |
| 205 |
|
| 206 |
public function get_name() { |
| 207 |
return 'wordpress_bulk_update_alt_text'; |
| 208 |
} |
| 209 |
|
| 210 |
public function get_description() { |
| 211 |
return 'Update alt text for multiple images at once (max 100 images per request)'; |
| 212 |
} |
| 213 |
|
| 214 |
public function get_input_schema() { |
| 215 |
return [ |
| 216 |
'type' => 'object', |
| 217 |
'properties' => [ |
| 218 |
'updates' => [ |
| 219 |
'type' => 'array', |
| 220 |
'description' => 'Array of alt text updates', |
| 221 |
'items' => [ |
| 222 |
'type' => 'object', |
| 223 |
'properties' => [ |
| 224 |
'attachment_id' => [ |
| 225 |
'type' => 'integer', |
| 226 |
'description' => 'Attachment ID', |
| 227 |
], |
| 228 |
'alt_text' => [ |
| 229 |
'type' => 'string', |
| 230 |
'description' => 'New alt text', |
| 231 |
], |
| 232 |
], |
| 233 |
'required' => ['attachment_id', 'alt_text'], |
| 234 |
], |
| 235 |
'maxItems' => 100, |
| 236 |
], |
| 237 |
], |
| 238 |
'required' => ['updates'], |
| 239 |
]; |
| 240 |
} |
| 241 |
|
| 242 |
public function execute($params) { |
| 243 |
$this->validate_params($params); |
| 244 |
$this->require_capability('upload_files'); |
| 245 |
|
| 246 |
if (!is_array($params['updates'])) { |
| 247 |
throw new Exception('updates must be an array'); |
| 248 |
} |
| 249 |
|
| 250 |
$updates = $params['updates']; |
| 251 |
|
| 252 |
if (count($updates) > 100) { |
| 253 |
throw new Exception('Maximum 100 images can be updated at once'); |
| 254 |
} |
| 255 |
|
| 256 |
$results = [ |
| 257 |
'success' => [], |
| 258 |
'failed' => [], |
| 259 |
]; |
| 260 |
|
| 261 |
foreach ($updates as $update) { |
| 262 |
try { |
| 263 |
if (!isset($update['attachment_id']) || !isset($update['alt_text'])) { |
| 264 |
throw new Exception('Missing required fields: attachment_id, alt_text'); |
| 265 |
} |
| 266 |
|
| 267 |
$attachment_id = intval($update['attachment_id']); |
| 268 |
$alt_text = sanitize_text_field($update['alt_text']); |
| 269 |
|
| 270 |
// Verify attachment exists |
| 271 |
$attachment = get_post($attachment_id); |
| 272 |
if (!$attachment || $attachment->post_type !== 'attachment') { |
| 273 |
$results['failed'][] = [ |
| 274 |
'attachment_id' => $attachment_id, |
| 275 |
'error' => 'Attachment not found', |
| 276 |
]; |
| 277 |
continue; |
| 278 |
} |
| 279 |
|
| 280 |
// Get old alt text |
| 281 |
$old_alt_text = get_post_meta($attachment_id, '_wp_attachment_image_alt', true); |
| 282 |
|
| 283 |
// Update alt text |
| 284 |
update_post_meta($attachment_id, '_wp_attachment_image_alt', $alt_text); |
| 285 |
|
| 286 |
$results['success'][] = [ |
| 287 |
'attachment_id' => $attachment_id, |
| 288 |
'filename' => basename($attachment->guid), |
| 289 |
'old_alt_text' => $old_alt_text, |
| 290 |
'new_alt_text' => $alt_text, |
| 291 |
'alt_length' => mb_strlen($alt_text), |
| 292 |
]; |
| 293 |
|
| 294 |
} catch (Exception $e) { |
| 295 |
$results['failed'][] = [ |
| 296 |
'attachment_id' => isset($update['attachment_id']) ? $update['attachment_id'] : null, |
| 297 |
'error' => $e->getMessage(), |
| 298 |
]; |
| 299 |
} |
| 300 |
} |
| 301 |
|
| 302 |
return $this->success([ |
| 303 |
'total_requested' => count($updates), |
| 304 |
'success_count' => count($results['success']), |
| 305 |
'failed_count' => count($results['failed']), |
| 306 |
'results' => $results, |
| 307 |
'message' => count($results['success']) . ' image(s) alt text updated successfully', |
| 308 |
]); |
| 309 |
} |
| 310 |
} |
| 311 |
|
| 312 |
/** |
| 313 |
* Generate Alt Text Tool |
| 314 |
* |
| 315 |
* Generates alt text suggestions based on image filename and context |
| 316 |
*/ |
| 317 |
class MCP_Tool_Generate_Alt_Text extends MCP_Tool_Base { |
| 318 |
|
| 319 |
public function get_name() { |
| 320 |
return 'wordpress_generate_alt_text'; |
| 321 |
} |
| 322 |
|
| 323 |
public function get_description() { |
| 324 |
return 'Generate alt text suggestions for images based on filename, title, and context. Useful as a starting point for manual editing.'; |
| 325 |
} |
| 326 |
|
| 327 |
public function get_input_schema() { |
| 328 |
return [ |
| 329 |
'type' => 'object', |
| 330 |
'properties' => [ |
| 331 |
'attachment_id' => [ |
| 332 |
'type' => 'integer', |
| 333 |
'description' => 'Attachment ID to generate alt text for', |
| 334 |
], |
| 335 |
'context' => [ |
| 336 |
'type' => 'string', |
| 337 |
'description' => 'Optional context (e.g., post title, surrounding text) to improve suggestions', |
| 338 |
], |
| 339 |
], |
| 340 |
'required' => ['attachment_id'], |
| 341 |
]; |
| 342 |
} |
| 343 |
|
| 344 |
public function execute($params) { |
| 345 |
$this->validate_params($params); |
| 346 |
$this->require_capability('upload_files'); |
| 347 |
|
| 348 |
$attachment_id = intval($params['attachment_id']); |
| 349 |
$context = isset($params['context']) ? sanitize_text_field($params['context']) : ''; |
| 350 |
|
| 351 |
// Verify attachment exists |
| 352 |
$attachment = get_post($attachment_id); |
| 353 |
if (!$attachment || $attachment->post_type !== 'attachment') { |
| 354 |
throw new Exception(sprintf("Attachment not found: %d", $attachment_id)); |
| 355 |
} |
| 356 |
|
| 357 |
// Get existing data |
| 358 |
$current_alt = get_post_meta($attachment_id, '_wp_attachment_image_alt', true); |
| 359 |
$title = $attachment->post_title; |
| 360 |
$filename = basename($attachment->guid); |
| 361 |
$caption = $attachment->post_excerpt; |
| 362 |
$description = $attachment->post_content; |
| 363 |
|
| 364 |
// Generate suggestions |
| 365 |
$suggestions = []; |
| 366 |
|
| 367 |
// Suggestion 1: Based on title |
| 368 |
if (!empty($title) && $title !== $filename) { |
| 369 |
$suggestions[] = [ |
| 370 |
'source' => 'title', |
| 371 |
'text' => $this->clean_text($title), |
| 372 |
'confidence' => 'high', |
| 373 |
]; |
| 374 |
} |
| 375 |
|
| 376 |
// Suggestion 2: Based on filename |
| 377 |
$filename_cleaned = $this->clean_filename($filename); |
| 378 |
if (!empty($filename_cleaned)) { |
| 379 |
$suggestions[] = [ |
| 380 |
'source' => 'filename', |
| 381 |
'text' => $filename_cleaned, |
| 382 |
'confidence' => 'medium', |
| 383 |
]; |
| 384 |
} |
| 385 |
|
| 386 |
// Suggestion 3: Based on caption |
| 387 |
if (!empty($caption)) { |
| 388 |
$suggestions[] = [ |
| 389 |
'source' => 'caption', |
| 390 |
'text' => $this->clean_text($caption), |
| 391 |
'confidence' => 'high', |
| 392 |
]; |
| 393 |
} |
| 394 |
|
| 395 |
// Suggestion 4: Based on description |
| 396 |
if (!empty($description)) { |
| 397 |
$suggestions[] = [ |
| 398 |
'source' => 'description', |
| 399 |
'text' => wp_trim_words($this->clean_text($description), 15), |
| 400 |
'confidence' => 'medium', |
| 401 |
]; |
| 402 |
} |
| 403 |
|
| 404 |
// Suggestion 5: Based on context |
| 405 |
if (!empty($context)) { |
| 406 |
$suggestions[] = [ |
| 407 |
'source' => 'context', |
| 408 |
'text' => $this->generate_contextual_alt($filename_cleaned, $context), |
| 409 |
'confidence' => 'medium', |
| 410 |
]; |
| 411 |
} |
| 412 |
|
| 413 |
// Remove duplicates |
| 414 |
$suggestions = $this->deduplicate_suggestions($suggestions); |
| 415 |
|
| 416 |
// Truncate to recommended length |
| 417 |
foreach ($suggestions as &$suggestion) { |
| 418 |
if (mb_strlen($suggestion['text']) > 125) { |
| 419 |
$suggestion['text'] = mb_substr($suggestion['text'], 0, 125); |
| 420 |
$suggestion['truncated'] = true; |
| 421 |
} |
| 422 |
} |
| 423 |
|
| 424 |
return $this->success([ |
| 425 |
'attachment_id' => $attachment_id, |
| 426 |
'filename' => $filename, |
| 427 |
'current_alt_text' => $current_alt, |
| 428 |
'needs_alt_text' => empty($current_alt), |
| 429 |
'suggestions' => $suggestions, |
| 430 |
'recommendation' => !empty($suggestions) ? $suggestions[0]['text'] : '', |
| 431 |
]); |
| 432 |
} |
| 433 |
|
| 434 |
/** |
| 435 |
* Clean filename for alt text |
| 436 |
*/ |
| 437 |
private function clean_filename($filename) { |
| 438 |
// Remove extension |
| 439 |
$filename = preg_replace('/\.[^.]+$/', '', $filename); |
| 440 |
|
| 441 |
// Replace separators with spaces |
| 442 |
$filename = str_replace(['-', '_', '.'], ' ', $filename); |
| 443 |
|
| 444 |
// Remove numbers if they're just IDs |
| 445 |
$filename = preg_replace('/\b\d{4,}\b/', '', $filename); |
| 446 |
|
| 447 |
// Clean up whitespace |
| 448 |
$filename = trim(preg_replace('/\s+/', ' ', $filename)); |
| 449 |
|
| 450 |
// Capitalize words |
| 451 |
$filename = ucwords(strtolower($filename)); |
| 452 |
|
| 453 |
return $filename; |
| 454 |
} |
| 455 |
|
| 456 |
/** |
| 457 |
* Clean text for alt text |
| 458 |
*/ |
| 459 |
private function clean_text($text) { |
| 460 |
// Strip HTML tags |
| 461 |
$text = wp_strip_all_tags($text); |
| 462 |
|
| 463 |
// Clean up whitespace |
| 464 |
$text = trim(preg_replace('/\s+/', ' ', $text)); |
| 465 |
|
| 466 |
return $text; |
| 467 |
} |
| 468 |
|
| 469 |
/** |
| 470 |
* Generate contextual alt text |
| 471 |
*/ |
| 472 |
private function generate_contextual_alt($filename, $context) { |
| 473 |
$context_words = explode(' ', strtolower($context)); |
| 474 |
$filename_words = explode(' ', strtolower($filename)); |
| 475 |
|
| 476 |
// Find common words (simple relevance check) |
| 477 |
$common = array_intersect($context_words, $filename_words); |
| 478 |
|
| 479 |
if (!empty($common)) { |
| 480 |
return $filename . ' for ' . wp_trim_words($context, 8); |
| 481 |
} |
| 482 |
|
| 483 |
return $filename . ' related to ' . wp_trim_words($context, 8); |
| 484 |
} |
| 485 |
|
| 486 |
/** |
| 487 |
* Remove duplicate suggestions |
| 488 |
*/ |
| 489 |
private function deduplicate_suggestions($suggestions) { |
| 490 |
$seen = []; |
| 491 |
$unique = []; |
| 492 |
|
| 493 |
foreach ($suggestions as $suggestion) { |
| 494 |
$normalized = strtolower(trim($suggestion['text'])); |
| 495 |
if (!in_array($normalized, $seen)) { |
| 496 |
$seen[] = $normalized; |
| 497 |
$unique[] = $suggestion; |
| 498 |
} |
| 499 |
} |
| 500 |
|
| 501 |
return $unique; |
| 502 |
} |
| 503 |
} |
| 504 |
|
| 505 |
/** |
| 506 |
* Validate Alt Text Tool |
| 507 |
* |
| 508 |
* Validates alt text quality and provides improvement suggestions |
| 509 |
*/ |
| 510 |
class MCP_Tool_Validate_Alt_Text extends MCP_Tool_Base { |
| 511 |
|
| 512 |
public function get_name() { |
| 513 |
return 'wordpress_validate_alt_text'; |
| 514 |
} |
| 515 |
|
| 516 |
public function get_description() { |
| 517 |
return 'Validate alt text quality and get specific improvement suggestions based on accessibility and SEO best practices'; |
| 518 |
} |
| 519 |
|
| 520 |
public function get_input_schema() { |
| 521 |
return [ |
| 522 |
'type' => 'object', |
| 523 |
'properties' => [ |
| 524 |
'attachment_id' => [ |
| 525 |
'type' => 'integer', |
| 526 |
'description' => 'Attachment ID to validate', |
| 527 |
], |
| 528 |
], |
| 529 |
'required' => ['attachment_id'], |
| 530 |
]; |
| 531 |
} |
| 532 |
|
| 533 |
public function execute($params) { |
| 534 |
$this->validate_params($params); |
| 535 |
$this->require_capability('upload_files'); |
| 536 |
|
| 537 |
$attachment_id = intval($params['attachment_id']); |
| 538 |
|
| 539 |
// Verify attachment exists |
| 540 |
$attachment = get_post($attachment_id); |
| 541 |
if (!$attachment || $attachment->post_type !== 'attachment') { |
| 542 |
throw new Exception(sprintf("Attachment not found: %d", $attachment_id)); |
| 543 |
} |
| 544 |
|
| 545 |
$alt_text = get_post_meta($attachment_id, '_wp_attachment_image_alt', true); |
| 546 |
$filename = basename($attachment->guid); |
| 547 |
|
| 548 |
// Run validation checks |
| 549 |
$issues = []; |
| 550 |
$warnings = []; |
| 551 |
$passed = []; |
| 552 |
$score = 100; |
| 553 |
|
| 554 |
// Check 1: Alt text exists |
| 555 |
if (empty($alt_text)) { |
| 556 |
$issues[] = [ |
| 557 |
'severity' => 'error', |
| 558 |
'check' => 'alt_text_exists', |
| 559 |
'message' => 'Alt text is missing', |
| 560 |
'recommendation' => 'Add descriptive alt text that describes the image content and purpose', |
| 561 |
]; |
| 562 |
$score -= 100; |
| 563 |
} else { |
| 564 |
$passed[] = ['check' => 'alt_text_exists', 'message' => 'Alt text is present']; |
| 565 |
|
| 566 |
$alt_length = mb_strlen($alt_text); |
| 567 |
|
| 568 |
// Check 2: Length |
| 569 |
if ($alt_length < 10) { |
| 570 |
$issues[] = [ |
| 571 |
'severity' => 'error', |
| 572 |
'check' => 'length_too_short', |
| 573 |
'message' => "Alt text is too short ({$alt_length} characters)", |
| 574 |
'recommendation' => 'Expand alt text to be more descriptive (10-125 characters recommended)', |
| 575 |
]; |
| 576 |
$score -= 30; |
| 577 |
} elseif ($alt_length > 125) { |
| 578 |
$warnings[] = [ |
| 579 |
'severity' => 'warning', |
| 580 |
'check' => 'length_too_long', |
| 581 |
'message' => "Alt text is too long ({$alt_length} characters)", |
| 582 |
'recommendation' => 'Shorten alt text for better readability (125 characters max recommended)', |
| 583 |
]; |
| 584 |
$score -= 10; |
| 585 |
} else { |
| 586 |
$passed[] = ['check' => 'length_appropriate', 'message' => 'Alt text length is appropriate']; |
| 587 |
} |
| 588 |
|
| 589 |
// Check 3: Not just filename |
| 590 |
if (strtolower($alt_text) === strtolower(pathinfo($filename, PATHINFO_FILENAME))) { |
| 591 |
$warnings[] = [ |
| 592 |
'severity' => 'warning', |
| 593 |
'check' => 'is_filename', |
| 594 |
'message' => 'Alt text appears to be just the filename', |
| 595 |
'recommendation' => 'Replace with descriptive text about the image content', |
| 596 |
]; |
| 597 |
$score -= 20; |
| 598 |
} else { |
| 599 |
$passed[] = ['check' => 'not_filename', 'message' => 'Alt text is not just the filename']; |
| 600 |
} |
| 601 |
|
| 602 |
// Check 4: Starts with redundant phrases |
| 603 |
$redundant_starts = ['image of', 'picture of', 'photo of', 'graphic of', 'icon of']; |
| 604 |
foreach ($redundant_starts as $phrase) { |
| 605 |
if (stripos($alt_text, $phrase) === 0) { |
| 606 |
$warnings[] = [ |
| 607 |
'severity' => 'warning', |
| 608 |
'check' => 'redundant_phrase', |
| 609 |
'message' => "Alt text starts with redundant phrase: \"{$phrase}\"", |
| 610 |
'recommendation' => 'Remove redundant phrases - screen readers already announce it\'s an image', |
| 611 |
]; |
| 612 |
$score -= 10; |
| 613 |
break; |
| 614 |
} |
| 615 |
} |
| 616 |
|
| 617 |
// Check 5: Contains special characters that screen readers struggle with |
| 618 |
if (preg_match('/[<>{}[\]\\|]/', $alt_text)) { |
| 619 |
$warnings[] = [ |
| 620 |
'severity' => 'warning', |
| 621 |
'check' => 'special_characters', |
| 622 |
'message' => 'Alt text contains special characters that may cause issues', |
| 623 |
'recommendation' => 'Remove special characters like <, >, {, }, [, ], \\, |', |
| 624 |
]; |
| 625 |
$score -= 5; |
| 626 |
} |
| 627 |
|
| 628 |
// Check 6: All caps |
| 629 |
if ($alt_text === strtoupper($alt_text) && $alt_length > 5) { |
| 630 |
$warnings[] = [ |
| 631 |
'severity' => 'warning', |
| 632 |
'check' => 'all_caps', |
| 633 |
'message' => 'Alt text is in all caps', |
| 634 |
'recommendation' => 'Use sentence case for better readability', |
| 635 |
]; |
| 636 |
$score -= 10; |
| 637 |
} |
| 638 |
} |
| 639 |
|
| 640 |
// Determine overall quality |
| 641 |
$quality = 'excellent'; |
| 642 |
if ($score < 50) { |
| 643 |
$quality = 'poor'; |
| 644 |
} elseif ($score < 70) { |
| 645 |
$quality = 'needs_improvement'; |
| 646 |
} elseif ($score < 90) { |
| 647 |
$quality = 'good'; |
| 648 |
} |
| 649 |
|
| 650 |
return $this->success([ |
| 651 |
'attachment_id' => $attachment_id, |
| 652 |
'filename' => $filename, |
| 653 |
'alt_text' => $alt_text, |
| 654 |
'alt_length' => mb_strlen($alt_text), |
| 655 |
'quality' => $quality, |
| 656 |
'score' => max($score, 0), |
| 657 |
'issues' => $issues, |
| 658 |
'warnings' => $warnings, |
| 659 |
'passed' => $passed, |
| 660 |
'total_checks' => count($issues) + count($warnings) + count($passed), |
| 661 |
]); |
| 662 |
} |
| 663 |
} |
| 664 |
|
