class.sniffer.php

<?php

/*
 * Class to compare user agent string with Voxeo Prophcy versions.
 */
class sniffer {
	
	private $smsUserAgentString = 'Voxeo-VXML/10';
	private $phoneUserAgentString = 'Voxeo-VXML/8';
	
	private $user_agent;
	private $channelType;
	
	public function __construct($user_agent) {
		$this->user_agent = $user_agent;
	}

	public function getChannelType() {
		
		if (strstr($this->user_agent, $this->phoneUserAgentString)) {
			$this->channelType = 'phone';
		}
		else if (strstr($this->user_agent, $this->smsUserAgentString)) {
			$this->channelType = 'sms';
		}
		else {
			throw new badSnifferException("An invalid user agent type was detected.");
		}
		return $this->channelType;
	}
}

/*
 * Simple class definition to handle instances where the user agent is not known.
 */ 
class badSnifferException extends Exception { }

?>