$this
on(Closure|string $first, string|null $operator = null, string|null $second = null, string $boolean = 'and')
Add an "on" clause to the join. On clauses can be chained, e.g. $join->on('contacts.userid', '=', 'users.id') ->on('contacts.infoid', '=', 'info.id') will produce the following SQL: on contacts.user_id = users.id and contacts.info_id = info.id Parameters
Closure|string $first string|null $operator string|null $second string $boolean Return Value $this