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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 |
|---|---|
| 3335 | * (`script`, `style`, `image`, `document`, etc). |
| 3336 | * @type string $crossorigin Indicates the CORS policy of the specified resource. |
| 3337 | * @type float $pr Expected probability that the resource hint will be used. |
| 3338 | * @type string $type Type of the resource (`text/html`, `text/css`, etc). |
| 3339 | * } |
| 3340 | * } |
| 3341 | * @param string $relation_type The relation type the URLs are printed for, |
| 3342 | * e.g. 'preconnect' or 'prerender'. |
| 3343 | */ |
| 3344 | $urls = apply_filters( 'wp_resource_hints', $urls, $relation_type ); |
| 3345 | |
| 3346 | foreach ( $urls as $key => $url ) { |
| 3347 | $atts = array(); |
| 3348 | |
| 3349 | if ( is_array( $url ) ) { |
| 3350 | if ( isset( $url['href'] ) ) { |
| 3351 | $atts = $url; |
| 3352 | $url = $url['href']; |
| 3353 | } else { |