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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 |
|---|---|
| 2839 | 'prefetch' => array(), |
| 2840 | 'prerender' => array(), |
| 2841 | ); |
| 2842 | |
| 2843 | /* |
| 2844 | * Add DNS prefetch for the Emoji CDN. |
| 2845 | * The path is removed in the foreach loop below. |
| 2846 | */ |
| 2847 | /** This filter is documented in wp-includes/formatting.php */ |
| 2848 | $hints['dns-prefetch'][] = apply_filters( 'emoji_svg_url', 'https://s.w.org/images/core/emoji/2.2.1/svg/' ); |
| 2849 | |
| 2850 | foreach ( $hints as $relation_type => $urls ) { |
| 2851 | $unique_urls = array(); |
| 2852 | |
| 2853 | /** |
| 2854 | * Filters domains and URLs for resource hints of relation type. |
| 2855 | * |
| 2856 | * @since 4.6.0 |
| 2857 | * |