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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 |
|---|---|
| 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'. |
| 2825 | */ |
| 2826 | $urls = apply_filters( 'wp_resource_hints', $urls, $relation_type ); |
| 2827 | |
| 2828 | foreach ( $urls as $key => $url ) { |
| 2829 | $url = esc_url( $url, array( 'http', 'https' ) ); |
| 2830 | if ( ! $url ) { |
| 2831 | unset( $urls[ $key ] ); |
| 2832 | continue; |
| 2833 | } |
| 2834 | |
| 2835 | if ( in_array( $relation_type, array( 'preconnect', 'dns-prefetch' ) ) ) { |