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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 |
|---|---|
| 3326 | |
| 3327 | /** |
| 3328 | * Filters domains and URLs for resource hints of relation type. |
| 3329 | * |
| 3330 | * @since 4.6.0 |
| 3331 | * |
| 3332 | * @param array $urls URLs to print for resource hints. |
| 3333 | * @param string $relation_type The relation type the URLs are printed for, e.g. 'preconnect' or 'prerender'. |
| 3334 | */ |
| 3335 | $urls = apply_filters( 'wp_resource_hints', $urls, $relation_type ); |
| 3336 | |
| 3337 | foreach ( $urls as $key => $url ) { |
| 3338 | $atts = array(); |
| 3339 | |
| 3340 | if ( is_array( $url ) ) { |
| 3341 | if ( isset( $url['href'] ) ) { |
| 3342 | $atts = $url; |
| 3343 | $url = $url['href']; |
| 3344 | } else { |