Tor Page Crawler

tor.php

<?php

/**
 * Tor Page Crawler
 * 
 * Download web pages anonymously using the Tor network.
 * Usage Example:
 *	$tor = new Tor();
 * 	
 * 	$tor->setUrl('http://zacharyflower.com');
 * 	$tor->setUserAgent('Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1667.0 Safari/537.36');
 * 	$tor->setReferer('http://twitter.com');
 * 	
 * 	$response = $tor->download();
 */

class Tor {
	private $url = NULL;
	private $user_agent = NULL;
	private $referer = NULL;
	private $tries = 0;
	private $max_tries = 10;
	
	private function scrambleIP(){
		$ip = '127.0.0.1';
		$port = '9051';
		$auth = 'password';
		$command = 'signal NEWNYM';
	
		$fp = fsockopen($ip, $port, $error_number, $err_string, 10);
	
		if(!$fp) {
			throw new Exception('Unable to connect to Tor service.');
		} else {
			fwrite($fp, "AUTHENTICATE \"".$auth."\"\n");
			$received = fread($fp, 512);
			fwrite($fp, $command."\n");
			$received = fread($fp, 512);
		}
	
		fclose($fp);
	}
	
	public function setUserAgent($user_agent = NULL){
		$this->user_agent = $user_agent;
	}
	
	public function setUrl($url = NULL){
		$this->url = $url;
	}
	
	public function setReferer($referer = NULL){
		$this->referer = $referer;
	}
	
	public function setMaxTries($max_tries = 10){
		if ( is_numeric($max_tries) ) {
			$this->max_tries = (int)$max_tries;
		}
	}
	
	public function download() {
		if ( empty($this->url) ) {
			throw new Exception('URL Required');	
		}
		
		$this->tries++;
		
		$ch = curl_init();

		curl_setopt($ch, CURLOPT_URL, $this->url);
		curl_setopt($ch, CURLOPT_FOLLOWLOCATION, TRUE);
		
		if ( !empty($this->referer) ) {
			curl_setopt($ch, CURLOPT_REFERER, $referer);
		}

		if ( !empty($this->user_agent) ) {
			curl_setopt($ch, CURLOPT_USERAGENT, $this->user_agent);
		}
		
		curl_setopt($ch, CURLOPT_HEADER, 0);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
		curl_setopt($ch, CURLOPT_TIMEOUT, 10);
		
		curl_setopt($ch, CURLOPT_PROXY, "127.0.0.1:9050");
		curl_setopt($ch, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
		
		$response = curl_exec($ch);
		$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
		
		if ( curl_errno($ch) ) {
			throw new Exception('cURL Error: '.curl_error($ch));
		}
		
		if ( $http_code != 200 ) {
			if ( $this->tries <= $this->max_tries ) {
				scramble_ip();
			
				return $this->download();
			} else {
				throw new Exception('Too many failed download attempts.');
			}
		}
		
		return $response;
	}
}

I'm just reading this quickly, but: shouldn't "scramble_ip()" be
"$this->scrambleIP()"?