PHP 简易爬虫

function get_urls($url)
   {
   	  $url_array=array();
   	  $the_first_content=file_get_contents($url);
   	  $the_second_content=file_get_contents($url);
   	  $pattern1 = "/http:\/\/[a-zA-Z0-9\.\?\/\-\=\&\:\+\-\_\'\"]+/";
   	  $pattern2="/http:\/\/[a-zA-Z0-9\.]+/";
   	  preg_match_all($pattern2, $the_second_content, $matches2);
   	  preg_match_all($pattern1, $the_first_content, $matches1);
   	  $new_array1=array_unique($matches1[0]);
   	  $new_array2=array_unique($matches2[0]);
   	  $final_array=array_merge($new_array1,$new_array2);
   	  $final_array=array_unique($final_array);
   	  for($i=0;$i<count($final_array);$i++)
   	  {
   	  	 echo $final_array[$i]."<br/>";
   	  }
   }
   get_urls("http://www.baidu.com");