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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 |
|---|---|
| 3190 | 'prefetch' => array(), |
| 3191 | 'prerender' => array(), |
| 3192 | ); |
| 3193 | |
| 3194 | /* |
| 3195 | * Add DNS prefetch for the Emoji CDN. |
| 3196 | * The path is removed in the foreach loop below. |
| 3197 | */ |
| 3198 | /** This filter is documented in wp-includes/formatting.php */ |
| 3199 | $hints['dns-prefetch'][] = apply_filters( 'emoji_svg_url', 'https://s.w.org/images/core/emoji/12.0.0-1/svg/' ); |
| 3200 | |
| 3201 | foreach ( $hints as $relation_type => $urls ) { |
| 3202 | $unique_urls = array(); |
| 3203 | |
| 3204 | /** |
| 3205 | * Filters domains and URLs for resource hints of relation type. |
| 3206 | * |
| 3207 | * @since 4.6.0 |
| 3208 | * |