WP_Site_Icon::get_post_metadata( null|array|string $value, int $post_id, string $meta_key, bool $single )

Adds custom image sizes when meta data for an image is requested, that happens to be used as Site Icon.



(null|array|string) (Required) The value get_metadata() should return a single metadata value, or an array of values.


(int) (Required) Post ID.


(string) (Required) Meta key.


(bool) (Required) Whether to return only the first value of the specified $meta_key.

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(array|null|string) The attachment metadata value, array of values, or null.

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File: wp-admin/includes/class-wp-site-icon.php

	public function get_post_metadata( $value, $post_id, $meta_key, $single ) {
		if ( $single && '_wp_attachment_backup_sizes' === $meta_key ) {
			$site_icon_id = get_option( 'site_icon' );

			if ( $post_id == $site_icon_id ) {
				add_filter( 'intermediate_image_sizes', array( $this, 'intermediate_image_sizes' ) );

		return $value;

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Version Description
4.3.0 Introduced.

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