count_many_users_posts( int[] $users, string|string[] $post_type, bool $public_only = false ): array<int,

Source

function count_many_users_posts( $users, $post_type = 'post', $public_only = false ) {
	global $wpdb;

	if ( empty( $users ) || ! is_array( $users ) ) {
		return array();
	}

	/**
	 * Filters whether to short-circuit performing the post counts.
	 *
	 * When filtering, return an array of posts counts as strings, keyed
	 * by the user ID.
	 *
	 * @since 6.8.0
	 *
	 * @param string[]|null   $count       The post counts. Return a non-null value to short-circuit.
	 * @param int[]           $users       Array of user IDs.
	 * @param string|string[] $post_type   Single post type or array of post types to check.
	 * @param bool            $public_only Whether to only return counts for public posts.
	 */
	$pre = apply_filters( 'pre_count_many_users_posts', null, $users, $post_type, $public_only );
	if ( null !== $pre ) {
		return $pre;
	}

	// Cleanup the users array. Remove duplicates and sort for consistent ordering.
	$users = array_unique( array_filter( array_map( 'intval', $users ) ) );
	sort( $users );

	// Cleanup the post type argument. Remove duplicates and sort for consistent ordering.
	$post_type = array_unique( (array) $post_type );
	sort( $post_type );

	$userlist    = implode( ',', $users );
	$where       = get_posts_by_author_sql( $post_type, true, null, $public_only );
	$query       = "SELECT post_author, COUNT(*) FROM $wpdb->posts $where AND post_author IN ($userlist) GROUP BY post_author";
	$cache_key   = 'count_many_users_posts:' . md5( $query );
	$cache_salts = array( wp_cache_get_last_changed( 'posts' ), wp_cache_get_last_changed( 'users' ) );
	$count       = wp_cache_get_salted( $cache_key, 'post-queries', $cache_salts );

	if ( false === $count ) {
		$result = $wpdb->get_results( $query, ARRAY_N );

		$count = array_fill_keys( $users, 0 );
		foreach ( $result as $row ) {
			$count[ $row[0] ] = $row[1];
		}

		wp_cache_set_salted( $cache_key, $count, 'post-queries', $cache_salts, HOUR_IN_SECONDS );
	}

	return $count;
}

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