php实现递归抓取网页类实例_PHP教程

php实现递归抓取网页类实例

 具体如下：

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class crawler{ private $_depth=5; private $_urls=array(); function extract_links($url) { if(!$this->_started){ $this->_started=1; $curr_depth=0; }else{ $curr_depth++; } if($curr_depth_depth) { $data=file_get_contents($url); if(preg_match_all('/((?:http|https)://(?:www.)*(?:[a-zA-Z0-9_-]{1,15}.+[a-zA-Z0-9_]{1,}){1,}(?:[a-zA-Z0-9_/.-?&:%,!;]*))/',$data,$urls12)) { foreach($urls12[0] as $k=>$v){ $check=get_headers($v,1); if(strstr($v,$url) && $check[0]=='HTTP/1.1 200 OK' && !array_search($v,$this->_urls) && $curr_depth_depth){ $this->_urls[]=$v; $this->extract_links($v); } } } } return $this->_urls; } } ?>

http://www.bkjia.com/PHPjc/978265.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/978265.htmlTechArticlephp实现递归抓取网页类实例 具体如下： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 ?php class crawler{ private $_depth=5; private...