简单PHP搜索引擎源代码，需要开启PHP的cURL扩展。功能：对某一网址进行检索，获取网站基本信
息，同时提取网站的所有连接。
class Engine{
private $_url = ''; //URL地址
private $_sites = ''; //页面信息
public function __construct($url){
$this->_url = $url;
}
//启动引擎
public function start(){
//$content = $this->socketOpen($this->_url);
$content = $this->getContent($this->_url);
$this->_sites['url'] = $this->_url;
$this->_sites['meta'] = $this->getMeta($content);
$this->_sites['title'] = $this->getTitle($content);
//$this->_sites['detail'] = $this->getDetail($content);
$this->_sites['links'] = $this->getLinks($content);
}
//获取meta内容
public function getMeta($content){
$file = 'metaCache';
file_put_contents($file,$content);
$meta = get_meta_tags($file);
return $meta;
}
//获取body内容
public function getDetail($content){
preg_match('/
(.*?)/i',$content,$matchs);
$body = $this->stripHTML($matchs[1]);
return substr($body,0,400);
}
//获取title内容
public function getTitle($content){
preg_match('/
(.+)/i',$content,$matchs);
return $matchs[1];
}
//获取a链接
public function getLinks($content){
$pat = '/](.*?)href="(.*?)"(.*?)>(.*?)/i';
preg_match_all($pat,$content,$matchs);
$result['href'] = $matchs[2];
$result['name'] = $this->stripTags($matchs[4]);
return $result;
}
//Socket监听
public function socketOpen($url){
$fp = fsockopen($url,80,$errno,$errstr,30);
if($fp === false){
echo "连接失败:$errstr($errno)
";
return false;
}
else{
$out = "GET/HTTP/1.1\r\n";
$out .= "Host:$url\r\n";
$out .= "Connection:Close\r\n";
fwrite($fp,$out);
$content = '';
while(!feof($fp)){
$content .= fgets($fp,1024);
}
fclose($fp);
var_dump($content);exit;
return $content;
}
}
//获取指定url内容
public function getContent($url){
$ch = @curl_init($url);
@curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible; MSIE
7.0; Windows NT 5.0)");
ob_start();
$result = @curl_exec($ch);
$content = ob_get_clean();
ob_end_clean();
@curl_close($ch);
return $content;
}
//取出script和style标签
public function stripHTML($string){
$pat = array(
"/
"/
);
$rep = array('','');
return preg_replace($pat,$rep,$string);
}
//去除数组元素的标签
public function stripTags(&$arr){
foreach ($arr as $key => $val )
{
if(is_array($val)){
$this->stripTags($arr[$key]);
}
else{
$arr[$key] = strip_tags($val);
}
}
return $arr;
}
function show(){
echo "
";
print_r($this->_sites);
echo "
";
}
//End Class Engine
}
$engine = new Engine('');
$engine->start();
$engine->show();
?>
这只是引擎的主要部分，接下来要做的就是把相关信息存入数据库，然后接着对所有获取的连接再
去检索，然后把相关信息再存入数据库，那么核心部分就是我们获取了这些信息之后根据信息内容
来设定网站的关键字，然后给他一个排名，供以后搜索。设定网站的排名和关键字只能你自己去想
了。
