Add(string $field, array|string $name, array|Cake\Validation\ValidationRule $rule [] )

• The name of the field from which the rule will be added.

• The alias for a single rule or multiple rules array.

• The rule to add

$this

Adds a new rule to a field’s rule set. If second argument is an array, then rules list for the field will be replaced with second argument and third argument will be ignored.

allowEmpty(string $field, boolean|string|callable $whentrue, string|null $messagenull)

• The name of the field.

• Indicates when the field is allowed to be empty. Valid values are true (always), ‘create’, ‘update’. If a callable is passed, then the field will be left empty only when the callback returns true.

• The message to show if the field is not.

Allows a field to be empty.

alphanumeric (string $field, string|null $messagenull, string|callable|null $whennull)

• The field you want to apply the rule to.

• The error message when the rule fails.

• Either ‘create’ or ‘update’ or a callable that returns true when the validation rule should be applied.

$this

Add an alphanumeric rule to a field.

creditCard(string $field , string $type‘all’, string|null $messagenull, string|callable|null $whennull)

• The field you want to apply the rule to.

• The type of cards you want to allow. Defaults to ‘all’. You can also supply an array of accepted card types, for example, [‘mastercard’, ‘visa’, ‘amex’].

• The error message when the rule fails.

• Either ‘create’ or ‘update’ or a callable that returns true, when the validation rule should be applied.

$this

Add a credit card rule to a field.

Email(string $field , boolean $checkMXfalse, string|null $messagenull, string|callable|null, $whennull)

• The field you want to apply the rule to.

• Whether or not to check the MX records.

• The error message when the rule fails.

• Either ‘create’ or ‘update’ or a callable that returns true, when the validation rule should be applied.

$this

Add an email validation rule to a field.

maxLength(string $field, integer $max, string|null $messagenull, string|callable|null $whennull)

• The field you want to apply the rule to.

• The maximum length allowed.

• The error message when the rule fails.

• Either ‘create’ or ‘update’ or a callable that returns true when the validation rule should be applied.

$this

Add a string length validation rule to a field.

minLength(string $field, integer $min, string|null $messagenull, string|callable|null $whennull)

• The field you want to apply the rule to.

• The maximum length allowed.

• The error message when the rule fails.

• Either ‘create’ or ‘update’ or a callable, that returns true when the validation rule should be applied.

$this

Add a string length validation rule to a field.

notBlank(string $field, string|null $messagenull, string|callable|null $whennull)

• The field you want to apply the rule to.

• The error message when the rule fails.

• Either ‘create’ or ‘update’ or a callable that returns true when the validation rule should be applied.

$this

Add a notBlank rule to a field.