How to Create Validators in CakePHP

Validator can be created by adding the following two lines in the controller.

use CakeValidationValidator; $validator = new Validator();

Validating Data

Once we have created validator, we can use the validator object to validate data. The following code explains how we can validate data for login webpage.

$validator->notEmpty(‘username’, ‘We need username.’)->add(‘username’, ‘validFormat’, [‘rule’ => ’email’,’message’ => ‘E-mail must be valid’]); $validator->notEmpty(‘password’, ‘We need password.’); $errors = $validator->errors($this->request->data());

Using the $validator object we have first called the notEmpty() method which will ensure that the username must not be empty. After that we have chained the add() method to add one more validation for proper email format.

After that we have added validation for password field with notEmpty() method which will confirms that password field must not be empty.

Example

Make Changes in the config/routes.php file as shown in the following program.

config/routes.php

<?php use CakeCorePlugin; use CakeRoutingRouteBuilder; use CakeRoutingRouter; Router::defaultRouteClass(‘DashedRoute’); Router::scope(‘/’, function (RouteBuilder $routes) { $routes->connect(‘validation’,[‘controller’=>’Valids’,’action’=>’index’]); $routes->fallbacks(‘DashedRoute’); }); Plugin::routes();

Create a ValidsController.php file at src/Controller/ValidsController.php. Copy the following code in the controller file.

src/Controller/ValidsController.php

<?php namespace AppController; use AppControllerAppController; use CakeValidationValidator; class ValidsController extends AppController{ public function index(){ $validator = new Validator(); $validator->notEmpty(‘username’, ‘We need username.’) ->add(‘username’, ‘validFormat’, [‘rule’ => ’email’,’message’ => ‘E-mail must be valid’]); $validator->notEmpty(‘password’, ‘We need password.’); $errors = $validator->errors($this->request->data()); $this->set(‘errors’,$errors); } } ?>

Create a directory Valids at src/Template and under that directory create a View file called index.ctp. Copy the following code in that file.

src/Template/Valids/index.ctp

<?php if($errors){ foreach($errors as $error) foreach($error as $msg) echo ‘<font color = “red”>’.$msg.'</font&gtl’; } else { echo “No errors.”; } echo $this->Form->create(“Logins”,array(‘url’=>’/validation’)); echo $this->Form->input(‘username’); echo $this->Form->input(‘password’); echo $this->Form->button(‘Submit’); echo $this->Form->end(); ?>

Execute the above example by visiting the following URL −http://localhost:85/CakePHP/validation

Output

Click on the submit button without entering anything.