Short example of how to receive data from an Ifbyphone IVR and send an XML response.

EmployeeValidationExample.php

<?php
/**
 *
 * Short example of how receive post data from
 * an Ifbyphone IVR and send a response after validation
 *
 * Example Usage:
 *
 * $example = new EmployeeValidationExample($_GET);
 * echo $example->sendXmlResponse();
 */
class EmployeeValidationExample
{   
    /**
     * @var int $cid
     */
    public $cid;
    /**
     * @var int $_employeeId
     */
    protected $_employeeId;
    
    /**
     *
     * Pass post or GET data to a method sets data
     *
     * @param array $options
     * @return null
     */
    public function __construct(array $options)
    {
        $this->_setOptions($options);
    }
    
    /**
     *
     * Set GET or POST data from constructor
     *
     * @param array $options
     * @return null
     */
    protected function _setOptions($options)
    {
        if (isset($options['EmployeeID'])) {
            $this->setEmployeeId($options['EmployeeID']);
        }
        if (isset($options['cid'])) {
            $this->setCid($options['cid']);
        }
    }
    
    /**
     *
     * Set Employee Id
     *
     * @param int $employeeId
     * @return null
     */
    public function setEmployeeId($employeeId)
    {
        $this->_employeeId = $employeeId;
    }
    
    /**
     *
     * Get Employee Id
     *
     * @return int $this->_employeeId
     */
    public function getEmployeeId()
    {
        return (int)$this->_employeeId;
    }
    
    /**
     *
     * Set Caller Id
     *
     * @param int $cid
     * @return null
     */
    public function setCid($cid)
    {
        $this->cid = $cid;
    }
    
    /**
     *
     * Get Caller Id
     *
     * @return int $this->cid
     */
    public function getCid()
    {
        return (int)$this->cid;
    }
    
    /** 
     *
     * List of valid Id's.  This information
     * would likely be stored in a database.
     *
     * @return array $validEmployeeIds
     */
    protected function _getValidId()
    {
        $validEmployeeIds = array(
            1234, 5678, 44556
        );
        return $validEmployeeIds;
    }
    
    /**
     *
     * Determine if a valid Id was provided by the caller
     *
     * @return bool true | false
     */
    public function validateEmployeeId()
    {
        if (in_array($this->getEmployeeId(), $this->_getValidId())) {
            return true;
        } else {
            return false;
        }
    }
    
    /**
     *
     * Build an XML response to route the caller to the next step of the call flow
     *
     * @param string $app
     * @param int    $app_id 
     * @param string $p_t
     * @param array  $user_params
     *
     * @return XML
     */
    public function buildXmlResponse($app, $app_id, $p_t = null, array $user_params = array())
    {
        $dom = new DOMDocument('1.0', 'utf-8');
        $response = $dom->appendChild(new DOMElement('action'));
        $response->appendChild(new DOMElement('app', $app));
        $parameter = $response->appendChild(new DOMElement('parameters'));
        $parameter->appendChild(new DOMElement('id', $app_id));
        $parameter->appendChild(new DOMElement('p_t', $p_t));
    
        if ($user_params) {
            $user_parameter = $parameter->appendChild(new DOMElement('user_parameters'));
            foreach ($user_params as $param => $value) {
                $user_parameter->appendChild(new DOMElement($param, $value));
            }
        }
        return $dom->saveXML();
    }
    
    /** 
     *
     * Logic to determine which XML response to send
     *
     * @return XML
     */
    public function sendXmlResponse()
    {
        if ($this->validateEmployeeId()) {
            //Route to a Survo that handles a valid Id
            return $this->buildXmlResponse('survo', 1234, null, array('first_name' => 'john'));
        } else {
            //Route to a Survo that handles invalid Id's
            return $this->buildXmlResponse('survo', 5678, null, array('first_name' => 'john'));
        }
    }
}