PHP

This class implemented to return null especially when the variable does not exists to avoid exceptions

Sample:

if (TRequest::inPost(array("category", "product")) == true) {
	$post_category = $this->validate_category(TRequest::fromPostObject("category"));
	$post_product  = $this->validate_product(TRequest::fromPostObject("product"));

	/* your code here to */
	//print $post_category->name;
}

to use this with GET/POST/COOKIE/SERVER etc, you need to transform the array into TNullClass object using the following function

/**
 * Transforms Array to stdClass
 * @param mixed $object
 * @return stdClass
 */
function array_to_nullclass($object) {
	$result = new TNullClass();

	if (is_array($object) === true) {
		foreach ($object as $key => $value) {
			$result->{$key} = $value;
		}
	}

	return $result;
}

TNullClass.php

<?php
/* ----------------------------------------------------------------------------
 * Teknober Web Services - All rights reserved
 * ----------------------------------------------------------------------------
 * File Name    : TNullClass.php
 * Section      : TNullClass
 * Dependicies  :
 * Description  : Implements TNullClass class
 *              : Special class implemented to return null when the variable
 *                does not exists to avoid exceptions
 * ----------------------------------------------------------------------------
 * Author       : Fatih Piristine
 * Company      : Teknober Web Services
 * E-mail       : v-fpiris@teknober.com
 * Web          : http://www.teknober.com
 * ----------------------------------------------------------------------------
 * $LastChangedBy$
 * $LastChangedDate$
 * $LastChangedRevision$
 * $HeadURL$
 * -------------------------------------------------------------------------- */

/**
 * TNullClass Class
 */
class TNullClass implements IteratorAggregate {
    public function getIterator () {
        return new ArrayIterator($this);
    }

    public function __get($index) {
        if ($this->exists($index) == false) {
            $this->{$index} = null;
        }

        return $this->{$index};
    }

    public function __set($index, $value) {
        $this->{$index} = $value;
    }

    public function exists($index) {
        return isset($this->{$index});
    }

    public function extend(TNullClass $object) {
        foreach ($object as $key => $value) {
            $this->{$key} = $value;
        }

        return $this;
    }

    public function isnull($index) {
        return is_null($this->{$index});
    }

    public function validate($index, $pattern) {
        return preg_match($pattern, $this->{$index});
    }

    public function length($index) {
        return strlen($this->{$index});
    }

}