PHP spider that scrapes websites from hotels found in a TripAdvisor search, and searches for a contact email within such website

hotelEmailSpider.php

<?php
	ini_set('display_errors',1);
	ini_set('display_startup_errors',1);
	error_reporting(-1);
	
	ini_set('max_execution_time', 1800);
	
	class TripAdvisorSpider{
		private $url; // Unused
		
		private $result_ids = array();
		
		public function __construct($search = false){
			//$this->url = "http://www.tripadvisor.es/Hotels-g187490-Castile_and_Leon-Hotels.html";
		}
		
		public function getStringBetween($string, $start, $end){
			$string = ' ' . $string;
			$ini = strpos($string, $start);
			if ($ini == 0) return '';
			$ini += strlen($start);
			$len = strpos($string, $end, $ini) - $ini;
			return substr($string, $ini, $len);
		}
		
		public function makeRequest($index){
			$ch = curl_init();
			curl_setopt($ch, CURLOPT_URL, "http://www.tripadvisor.es/Hotels");
			curl_setopt($ch,CURLOPT_POST, 10);
			curl_setopt($ch,CURLOPT_POSTFIELDS, "seen=0&sequence=1&geo=187490&requestingServlet=Hotels&refineForm=true&hs=&o=a".$index."&pageSize=1000&rad=0&dateBumped=NONE&displayedSortOrder=");
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
			curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

			$result = curl_exec ($ch);
			//return curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
			curl_close ($ch);
			
			//echo $result;
			
			$json = json_decode($this->getStringBetween($result, "hasOyster: ", "};"), true);
			
			foreach($json as $hotelid => $dummy){
				//echo $hotelid;
				$this->result_ids[$hotelid] = $this->getRealWebsite($hotelid);
				//array_push($this->result_ids, $hotelid);
			}
		}
		
		public function iterateResultPages($num_pages = 10){
			$i = 0;
			while ($i <= $num_pages){
				$this->makeRequest($i*25);
				//$i = $i + 25;
				$i++;
			}
			
			foreach ($this->result_ids as $key => $value){
				if ($value == false){
					unset($this->result_ids[$key]);
				}else{
					$matches = array();
					$pattern = '/[A-Za-z0-9_-]+@[A-Za-z0-9_-]+\.([A-Za-z0-9_-][A-Za-z0-9_]+)/';
					preg_match($pattern, file_get_contents($value), $matches);
					if (sizeOf($matches) > 0){
						$this->result_ids[$key] = $matches[0];
					}else{
						unset($this->result_ids[$key]);
					}
				}
			}
			
			/*
			echo '<pre>';
			print_r($this->result_ids);
			echo '</pre>';
			*/
			
			foreach ($this->result_ids as $hotelId => $hotelEmaiil){
				echo $hotelEmaiil;
				echo '</br>';
			}
			
		}
		
		public function getRealWebsite ($id = false){
			if ($id){
				$ta_url = "http://www.tripadvisor.es/ShowUrl?&excludeFromVS=false&odc=BusinessListingsUrl&d=$id&url=0";
				
				$ch = curl_init();
				curl_setopt($ch, CURLOPT_URL, $ta_url);
				curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
				curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

				$result = curl_exec ($ch);
				$last_url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
				curl_close ($ch);
				
				if ($last_url == $ta_url)
					return false;
				
				return $last_url;
			}
		}
	}
	
	$ta = new TripAdvisorSpider();
	echo $ta->iterateResultPages(19); // 19 pages for Castille and Leon
?>