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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 |
---|---|
3063 |
|
3064 | /** |
3065 | * Filters domains and URLs for resource hints of relation type. |
3066 | * |
3067 | * @since 4.6.0 |
3068 | * |
3069 | * @param array $urls URLs to print for resource hints. |
3070 | * @param string $relation_type The relation type the URLs are printed for, e.g. 'preconnect' or 'prerender'. |
3071 | */ |
3072 | $urls = apply_filters( 'wp_resource_hints', $urls, $relation_type ); |
3073 |
|
3074 | foreach ( $urls as $key => $url ) { |
3075 | $atts = array(); |
3076 |
|
3077 | if ( is_array( $url ) ) { |
3078 | if ( isset( $url['href'] ) ) { |
3079 | $atts = $url; |
3080 | $url = $url['href']; |
3081 | } else { |