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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 |
|---|---|
| 3625 | * @type string $crossorigin Indicates the CORS policy of the specified resource. |
| 3626 | * @type string $type Type of the resource (`text/html`, `text/css`, etc). |
| 3627 | * @type string $media Accepts media types or media queries. Allows responsive preloading. |
| 3628 | * @type string $imagesizes Responsive source size to the source Set. |
| 3629 | * @type string $imagesrcset Responsive image sources to the source set. |
| 3630 | * @type string $fetchpriority Fetchpriority value for the resource. |
| 3631 | * } |
| 3632 | * } |
| 3633 | */ |
| 3634 | $preload_resources = apply_filters( 'wp_preload_resources', array() ); |
| 3635 | |
| 3636 | if ( ! is_array( $preload_resources ) ) { |
| 3637 | return; |
| 3638 | } |
| 3639 | |
| 3640 | $unique_resources = array(); |
| 3641 | |
| 3642 | // Parse the complete resource list and extract unique resources. |
| 3643 | foreach ( $preload_resources as $resource ) { |