void replacer(string $rule, Closure|string $replacer)

$this whereNull(string $column) Set a "where null" constraint on the query

ValidationException class ValidationException extends Exception

$this where(string $column, string $value = null) Set a "where" constraint

Validator make(array $data, array $rules, array

bool passes() Determine if the data passes the validation rules.

ValidationServiceProvider class ValidationServiceProvider extends

MessageBag messages()

bool hasAttribute(string $attribute) Checks if an attribute exists.

$this ratio(float $value) Set the "ratio" constraint.