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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 |
|---|---|
| 2806 | 'prefetch' => array(), |
| 2807 | 'prerender' => array(), |
| 2808 | ); |
| 2809 | |
| 2810 | /* |
| 2811 | * Add DNS prefetch for the Emoji CDN. |
| 2812 | * The path is removed in the foreach loop below. |
| 2813 | */ |
| 2814 | /** This filter is documented in wp-includes/formatting.php */ |
| 2815 | $hints['dns-prefetch'][] = apply_filters( 'emoji_svg_url', 'https://s.w.org/images/core/emoji/2/svg/' ); |
| 2816 | |
| 2817 | foreach ( $hints as $relation_type => $urls ) { |
| 2818 | /** |
| 2819 | * Filters domains and URLs for resource hints of relation type. |
| 2820 | * |
| 2821 | * @since 4.6.0 |
| 2822 | * |
| 2823 | * @param array $urls URLs to print for resource hints. |
| 2824 | * @param string $relation_type The relation type the URLs are printed for, e.g. 'preconnect' or 'prerender'. |