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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 486 | |
| 487 | // We have an image without a thumbnail |
| 488 | |
| 489 | $src = $post->guid; |
| 490 | $src_file = & $file; |
| 491 | $class = 'attachmentimage'; |
| 492 | } elseif (! empty($mime) ) { |
| 493 | |
| 494 | // No thumb, no image. We'll look for a mime-related icon instead. |
| 495 | $icon_dir = apply_filters('icon_dir', get_template_directory().'/images'); |
| 496 | $icon_dir_uri = apply_filters('icon_dir_uri', get_template_directory_uri().'/images'); |
| 497 | |
| 498 | $types = array(substr($mime, 0, strpos($mime, '/')), substr($mime, strpos($mime, '/') + 1), str_replace('/', '_', $mime)); |
| 499 | $exts = array('jpg', 'gif', 'png'); |
| 500 | foreach ($types as $type) { |
| 501 | foreach ($exts as $ext) { |
| 502 | $src_file = "$icon_dir/$type.$ext"; |
| 503 | if ( file_exists($src_file) ) { |
| 504 | $src = "$icon_dir_uri/$type.$ext"; |