CakePHP - Validation


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Often while making websites we need to validate certain things before processing data further. CakePHP provides validation package to build validators that can validate data with ease.

Validation Methods

CakePHP provides various validation methods in the Validation Class. Some of the most popular of them are listed below.

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

Returns $this
Description 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.
Syntax allowEmpty (string $field, boolean|string|callable $when true, string|null $message null)
Parameters
  • 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.

Returns $this
Description Allows a field to be empty.
Syntax alphanumeric (string $field, string|null $message null, string|callable|null $when null)
Parameters
  • 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.

Returns $this
Description Add an alphanumeric rule to a field.
Syntax creditCard (string $field, string $type 'all', string|null $message null, string|callable|null $when null)
Parameters
  • 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.

Returns $this
Description Add a credit card rule to a field.
Syntax Email (string $field, boolean $checkMX false, string|null $message null, string|callable|null $when null)
Parameters
  • 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.

Returns $this
Description Add an email validation rule to a field.
Syntax maxLength (string $field, integer $max, string|null $message null, string|callable|null $when null)
Parameters
  • 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.

Returns $this
Description Add a string length validation rule to a field.
Syntax minLength (string $field, integer $min, string|null $message null, string|callable|null $when null)
Parameters
  • 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.

Returns $this
Description Add a string length validation rule to a field.
Syntax notBlank (string $field, string|null $message null, string|callable|null $when null)
Parameters
  • 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.

Returns $this
Description Add a notBlank rule to a field.


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