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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 |
---|---|
3306 | 'prefetch' => array(), |
3307 | 'prerender' => array(), |
3308 | ); |
3309 |
|
3310 | /* |
3311 | * Add DNS prefetch for the Emoji CDN. |
3312 | * The path is removed in the foreach loop below. |
3313 | */ |
3314 | /** This filter is documented in wp-includes/formatting.php */ |
3315 | $hints['dns-prefetch'][] = apply_filters( 'emoji_svg_url', 'https://s.w.org/images/core/emoji/13.0.0/svg/' ); |
3316 |
|
3317 | foreach ( $hints as $relation_type => $urls ) { |
3318 | $unique_urls = array(); |
3319 |
|
3320 | /** |
3321 | * Filters domains and URLs for resource hints of relation type. |
3322 | * |
3323 | * @since 4.6.0 |
3324 | * @since 4.7.0 The `$urls` parameter accepts arrays of specific HTML attributes |