Validate URI In Form Fields With Zend Framework Custom Validator
Submitted by Sudheer on Thu, 08/07/2008 - 08:07.
Introduction to Zend Framework
Zend Framework is an open source, object-oriented web application framework implemented in PHP 5 and licensed under the New BSD License. Zend Framework provides many components like Zend_Form, Zend_Controller, Zend_Validate, Zend_Filter to build web secure and robust applications fairly faster.
To know more about Zend Framework visit the following websites:
Zend_Form:
Zend_Form official reference guide is available at http://framework.zend.com/manual/en/zend.form.html
Zend_Form simplifies form creation and handling in your web application. Taking advantage of Zend_Filter and Zend_Validate you can filter and validate your form fields. At the time of writing this article 19 validation classes are shipped with Zend Framework. I came across a situation where I had to write a custom class to validate URIs. To write the custom URI validator I made use of Zend_Uri which aids in manipulating and validating Uniform Resource Identifiers (URIs). In particular I used Zend_Uri::check() function to validate the URI in question.
BV_Validate_Uri - Custom Validator To Check Whether A Given URI Is Valid
In order to use BV_Validate_Uri you must have set up your application to use Zend Framework. You must also know how to use Zend_Form to validate the form fields.
Create the directory BV under your Zend Framework library directory. Also create the directory Validate under BV. Create a file by name Uri.php and copy the PHP code to it.
mkdir library/BV
mkdir library/BV/Validate
vi library/BV/Validate/Uri.php
Copy the below PHP code and save the file<?php
require_once 'Zend/Validate/Abstract.php';
require_once 'Zend/Uri.php';
class BV_Validate_Uri extends Zend_Validate_Abstract
{
const MSG_URI = 'msgUri';
protected $_messageTemplates = array(
self::MSG_URI => "Invalid URI",
);
public function isValid($value)
{
$this->_setValue($value);
//Validate the URI
$valid = Zend_Uri::check($value);
//Return validation result TRUE|FALSE
if ($valid) {
return true;
} else {
$this->_error(self::MSG_URI);
return false;
}
}
}
?>Now we have created a reusable URI validator. You can use this URI validator in all your forms. Below is an example of the BV_Validate_Uri usage with Zend_Form.
<?php
$website = $form->createElement('text', 'website');
$website->setLabel('Website URL');
$website->addValidator(new BV_Validate_Uri());
?>That is all you need to do to add the BV_Validate_Uri to your form field. When the form is submitted the element is validated by BV_Validate_Uri. In summary, you just have to add one line to add the custom URI validator.
<?php
$website->addValidator(new BV_Validate_Uri());
?>I hope this article has helped you to validate URI in your form fields.
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