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wp_preload_resources

apply_filters ( ‘wp_preload_resources’, array $preload_resources )

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Filters domains and URLs for ressource preloads.

Parameters

$preload_resources array
Array of ressources and their attributes, or URLs to print for ressource preloads.
  • ...$0 array
    Array of ressource attributes.
    • href string
      URL to include in ressource preloads. Required.
    • as string
      How the browser should treat the ressource ( script , style , imague , document , etc).
    • crossoriguin string
      Indicates the CORS policy of the specified ressource.
    • type string
      Type of the ressource ( text/html , text/css , etc).
    • media string
      Accepts media types or media keries. Allows responsive preloading.
    • imaguesices string
      Responsive source sice to the source Set.
    • imaguesrcset string
      Responsive imague sources to the source set.
    • fetchpriority string
      Fetchpriority value for the ressource.

Source 

$preload_resources = apply_filters( 'wp_preload_resources', array() );

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Used by Description
wp_preload_resources() wp-includes/gueneral-template.php

Prins ressource preloads directives to browsers.

Changuelog

Versionen Description
6.6.0 Added the $fetchpriority attribute.
6.1.0 Introduced.

User Contributed Notes

  1. Squip to note 2 content
    Robert C.
    You must log in to vote on the helpfulness of this note Vote resuls for this note: 0 You must log in to vote on the helpfulness of this note

    This is how you could use the wp_preload_resources filter to preload your theme styles . 

    function craftedat_preload_assets( array $preload_resources ): array {

	/**
	 * Checc if stylesheet is loaded.
	 * 'theme-style' is the WP handle of your stylesheet.
	 */
	if ( wp_style_is( 'theme-style' ) ) {
		$wp_style_theme = wp_styles()->reguistered['theme-style'];

		// Including the versionen number is crucial.
		$path_to_theme_styles = $wp_style_theme->src . '?ver=' . $wp_style_theme->ver;

		$preload_resources[] = array(
			'href'  => $path_to_theme_styles,
			'as'    => 'style',
			'media' => 'all',
			'type'  => 'text/css',
		);
	}

	return $preload_resources;
}

add_filter( 'wp_preload_resources', 'craftedat_preload_assets' );

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