Example of Template Pattern

MobileStreamRequest.php

<?php
	abstract class MobileStreamsReqest	{
		private $_username;
		private $_password;
		private $_URI;
		private $_version;
		
		protected $parameters = array();
		protected $requestAttrbutes = array();
		protected $requestString;
		
		
		const ATTRIBUTE_REQUIRED = "required";
		const ATTRIBUTE_OPTIONAL = "optional";
		
		public function __construct($username, $password, $URI, $version="1.1")	{
			$this->_username = $username;
			$this->_password = $password;
			$this->_URI = $URI;
			$this->_version = $version;
			$this->setParameters();
		}
		
		protected abstract function setParameters();
		protected abstract function formatRequestString($attributes = array());
		
		private function validateParameters($attributes = array())	{
			if (!empty($attributes))	{
				$keys_array = asort(array_keys($attributes));
				$required = asort($this->getRequiredParameters());				
				$intersected = asort(array_intersect($required, $keys_array));
				if ($intersected == $required)
					return TRUE;
			}
			return FALSE;
		}
		
		public function doRequest($attributes = array())	{
			$formatted_string = $this->formatRequestString($attributes);
			
			$this->setRequestString($formatted_string);
			$headers = array();
			$headers[] = "Content-Type: text/xml";
			$plist = "xml=".$this->requestString;
			$ch = curl_init();
			curl_setopt($ch, CURLOPT_URL, $this->_URI);
			curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
			curl_setopt($ch, CURLOPT_POSTFIELDS, $plist); //adding POST data
			curl_setopt($ch, CURLOPT_POST, TRUE); //data sent as POST
			$result = curl_exec($ch);
			curl_close($ch);
			
			return $result;
		}	
		
		private function setRequestString($str)	{
			$xml = '<?xml version="1.0" encoding="utf-16"?>';
			$xml .= '<MSCDP username="'.$this->_username.'" password="'.$this->_password.'" version="'.$this->_version.'">';
			$xml .= '<REQUEST>';
			$xml .= $str;
			$xml .= '</REQUEST>';
			$xml .= '</MSCDP>';
			$this->requestString = $xml;
		}
		
		private function getRequiredParameters()	{
			$parameter_keys = array_keys($this->parameters);
			$required_parameters = array();
			foreach ($this->parameters as $key => $value) {
				if ($value == self::ATTRIBUTE_REQUIRED)
					$required_parameters[] = $key;
			}
			return $required_parameters;
		}
	}

        
	class Request_Content_Info extends MobileStreamsReqest	{
		public function __construct($username, $password, $URI)	{
			parent::__construct($username, $password, $URI);
		}
		
		protected function setParameters()	{
			$this->parameters = array(
				'id' => self::ATTRIBUTE_REQUIRED,
				'reference' => self::ATTRIBUTE_REQUIRED,
				'service' => self::ATTRIBUTE_REQUIRED 
			);
		}
		
		protected function formatRequestString($attributes = array())	{
			$parameters = array_keys($this->parameters);
			$xml = '<CONTENT_INFO '.$parameters[0].'="'.$attributes[$parameters[0]].'" '.$parameters[2].'="'.$attributes[$parameters[2]].'" '.$parameters[1].'="'.$attributes[$parameters[1]].'" />';
			return $xml;
		}
		
	}

      
        class Request_Customer_Content extends MobileStreamsReqest	{
		public function __construct($username, $password, $URI)	{
			parent::__construct($username, $password, $URI);
		}
		
		protected function setParameters()	{
			$this->parameters = array(
				'id' => self::ATTRIBUTE_REQUIRED,
				'device' => self::ATTRIBUTE_OPTIONAL,
				'genre' => self::ATTRIBUTE_OPTIONAL ,
				'itens' => self::ATTRIBUTE_OPTIONAL,
				'offset' => self::ATTRIBUTE_OPTIONAL,
				'service' => self::ATTRIBUTE_OPTIONAL,
				'device_info' => self::ATTRIBUTE_OPTIONAL,
				'media_type' => self::ATTRIBUTE_OPTIONAL,
				'notify' => self::ATTRIBUTE_OPTIONAL,
				'start' => self::ATTRIBUTE_OPTIONAL,
				'end' => self::ATTRIBUTE_OPTIONAL
			);
		}
		
		protected function formatRequestString($attributes = array())	{
			$parameters = array_keys($this->parameters);
			$xml = '<CONTENT_INFO '.$parameters[0].'="'.$attributes[$parameters[0]].'" '.$parameters[2].'="'.$attributes[$parameters[2]].'" '.$parameters[1].'="'.$attributes[$parameters[1]].'" />';
			return $xml;
		}
	}

        //////////////////////////////////////////////
        //////////////////PROGRAM/////////////////////
        //////////////////////////////////////////////

       $request_content_info = new Request_Content_Info("username","secret", "http://cgi.mscdp.com/xmlold");
	echo $r->doRequest(array(
		'id' => 1,
		'service' => 167,
		'reference' => "017798"
	)); //XML response from server

        $request_customer_content = new Request_Customer_Content("username","secret", "http://cgi.mscdp.com/xmlold");
	echo $r->doRequest(array(
		'id' => 1,
		'service' => 167,
		'reference' => "017798"
	));

?>