$this put(mixed $key, mixed $value) Put an item in the collection by key. Parameters mixed $key mixed $value Return Value $this

mixed avg(string $column) Retrieve the average of the values of a given column. Parameters string $column Return Value mixed

void info(string $string, null|int|string $verbosity = null) Write a string as information output. Parameters string $string null|int|string $verbosity Return Value void