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function is not described

_prime_comment_caches() WP 4.4.0

Adds any comments from the given IDs to the cache that do not already exist in cache.

This is an internal function for using it by WP core itself. It's not recommended to use this function in your code.

No Hooks.

Return

null. Nothing.

Usage

_prime_comment_caches( $comment_ids, $update_meta_cache );
$comment_ids(int[]) (required)
Array of comment IDs.
$update_meta_cache(true|false)
Whether to update the meta cache.
Default: true

Notes

Code of _prime_comment_caches() WP 5.8.3

function _prime_comment_caches( $comment_ids, $update_meta_cache = true ) {
	global $wpdb;

	$non_cached_ids = _get_non_cached_ids( $comment_ids, 'comment' );
	if ( ! empty( $non_cached_ids ) ) {
		$fresh_comments = $wpdb->get_results( sprintf( "SELECT $wpdb->comments.* FROM $wpdb->comments WHERE comment_ID IN (%s)", implode( ',', array_map( 'intval', $non_cached_ids ) ) ) );

		update_comment_cache( $fresh_comments, $update_meta_cache );
	}
}