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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 |
|---|---|
| 3603 | * (`script`, `style`, `image`, `document`, etc). |
| 3604 | * @type string $crossorigin Indicates the CORS policy of the specified resource. |
| 3605 | * @type string $type Type of the resource (`text/html`, `text/css`, etc). |
| 3606 | * @type string $media Accepts media types or media queries. Allows responsive preloading. |
| 3607 | * @type string $imagesizes Responsive source size to the source Set. |
| 3608 | * @type string $imagesrcset Responsive image sources to the source set. |
| 3609 | * } |
| 3610 | * } |
| 3611 | */ |
| 3612 | $preload_resources = apply_filters( 'wp_preload_resources', array() ); |
| 3613 | |
| 3614 | if ( ! is_array( $preload_resources ) ) { |
| 3615 | return; |
| 3616 | } |
| 3617 | |
| 3618 | $unique_resources = array(); |
| 3619 | |
| 3620 | // Parse the complete resource list and extract unique resources. |
| 3621 | foreach ( $preload_resources as $resource ) { |