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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 |
|---|---|
| 3315 | 'prefetch' => array(), |
| 3316 | 'prerender' => array(), |
| 3317 | ); |
| 3318 | |
| 3319 | /* |
| 3320 | * Add DNS prefetch for the Emoji CDN. |
| 3321 | * The path is removed in the foreach loop below. |
| 3322 | */ |
| 3323 | /** This filter is documented in wp-includes/formatting.php */ |
| 3324 | $hints['dns-prefetch'][] = apply_filters( 'emoji_svg_url', 'https://s.w.org/images/core/emoji/13.0.0/svg/' ); |
| 3325 | |
| 3326 | foreach ( $hints as $relation_type => $urls ) { |
| 3327 | $unique_urls = array(); |
| 3328 | |
| 3329 | /** |
| 3330 | * Filters domains and URLs for resource hints of relation type. |
| 3331 | * |
| 3332 | * @since 4.6.0 |
| 3333 | * @since 4.7.0 The `$urls` parameter accepts arrays of specific HTML attributes |