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

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;
	}

	$userlist = implode( ',', array_map( 'absint', $users ) );
	$where    = get_posts_by_author_sql( $post_type, true, null, $public_only );

	$result = $wpdb->get_results( "SELECT post_author, COUNT(*) FROM $wpdb->posts $where AND post_author IN ($userlist) GROUP BY post_author", ARRAY_N );

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

	return $count;
}

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