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<?php
/**
 * 磁力链接下载，根据 关键词 文件大小 保存到指定文件中
 */
class Magnet{
	
	public $host='https://btdigg.org/';//域名
	public $keyWord='';//关键词
	public $minSize=0;//文件大小最小值
	public $saveFile='';//存储文件
	
	public $flag=true;//是否继续翻页
	public $page=0;//当前页面
	protected $_url='';//当前的url
	protected $_html='';//当前的url的html文件内容
	protected $_magnet=array();//保存磁力链接的数组
	protected $_currentMagnetCount=0;//当前磁力链接的数量
	protected $_magnetCount=0;//磁力链接的总数
	public $timeout=10;//页面超时设置
	public $maxPage=1000;
	public $magnetNum=0;
	public $timestamp=0;
	
	public function __construct($keyWord,$saveFile='./magnet.log',$minSize=0,$pageRange=array(0,1000)){
		$this->keyWord=$keyWord;
		$this->saveFile=$saveFile;
		$this->minSize=$minSize;
		$this->page=$pageRange[0];
		$this->maxPage=$pageRange[1];
	}
	
	public function run(){
	    
		while($this->flag && $this->maxPage>$this->page){
		    $this->timestamp=$this->microtimeFloat();
			$this->_execute();
			$this->page++;
			$this->_notice();
			
		}
	}
	/**
	 * 执行
	 */
	protected function _execute(){
	    
		$this->_getUrl();
		$this->_getHtmlPage();
		$this->_parseHtml();
		if($this->_currentMagnetCount){//当有磁力链接时保存
			$this->_save();
		}
		
	}
	
	public function microtimeFloat(){
        list($usec, $sec) = explode(" ", microtime());
        return sprintf('%01.2f',(float)$usec + (float)$sec);
    }
    /**
     * 通知
     */
	protected function _notice(){
	    
	    $currentTime = $this->microtimeFloat();
	    $useTime =sprintf('%01.2f', $currentTime-$this->timestamp);
	    $this->timestamp = $currentTime;
	    echo '第'.$this->page.'页存储了'.$this->_currentMagnetCount.'个磁力链接,耗时'.$useTime."秒\r\n";
		if(!($this->flag && $this->maxPage>$this->page)){
			echo '总共存储了'.$this->_magnetCount.'个磁力链接'."\r\n";
		}
	}
    /**
     * 设置url
     */
	protected function _getUrl(){
	    
		$this->_url = $this->host.'search?q='.rawurlencode($this->keyWord).'&p='.$this->page;	
	}
	/**
	 * 获得html文件内容
	 */
	protected function _getHtmlPage(){
	    
		$ch = curl_init();
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_TIMEOUT,$this->timeout);
        curl_setopt($ch, CURLOPT_URL, $this->_url);
        curl_setopt($ch, CURLOPT_SSLVERSION,3); 
        $result = curl_exec($ch);
        if($result === false){
            //echo 'Curl error: '. curl_errno($ch) .' : '. curl_error($ch);
            $opts = array(
                'https'=>array(
                    'method'=>"GET",
                    'timeout'=>$this->timeout,//单位秒
                )
            );
            $context = stream_context_create($opts);
            $this->_html =  @file_get_contents($this->_url,false,$context);
        }else{
            $this->_html = $result;
        }
        curl_close($ch);
	}
    /**
     * 抓取磁力链接
     */
	protected function _parseHtml(){
	    
		preg_match_all('/href="(magnet\:\?xt=urn\:btih\:.+?)"/',$this->_html,$magnet);
		preg_match_all('/attr_val">(\d+?\.?\d*?&nbsp;[G|M|K]B)<\/span>/',$this->_html,$size);
		if(empty($size[1])){
			$this->flag=false;//当获取磁力链接时不到时，停止翻页
		}
		foreach($size[1] as $key=>$val){
			if($this->_compareSize($val)){
				$this->_magnet[]=$magnet[1][$key];
			}		
		}
		$this->_currentMagnetCount = count($this->_magnet);
		$this->_magnetCount += count($this->_magnet);
	}
    /**
     * 比较磁力链接文件的大小
     */
	protected function _compareSize($size){
	    
		$number = substr($size,0,strpos($size,'&nbsp;'));
		$unit = substr($size,strpos($size,'&nbsp;')+6);

		$n='';
		switch($unit){
			case 'GB':
					$n=1;
					break;
			case 'MB':
					$n=1024;
					break;
			case 'KB':
					$n=1048576;
					break;
			default :
					$n=false;
		}
		if($n===false){
		    try {
		        throw new Exception("文件大小单位识别失败\n");
		    } catch (Exception $e) {
		        echo $e->getMessage();
		        return false;
		    }
			
		}
		return ( $this->minSize < ($number/$n) );
	}
    /**
     * 把磁力链接保存到文件中
     */
	protected function _save(){
	    
	    $data = '';
		foreach($this->_magnet as $val){
		    $data .= $val."\n";
		    $this->magnetNum++;
		    if(0==$this->magnetNum%15)
		      $data.="\n\n";
		}
		file_put_contents($this->saveFile,$data,FILE_APPEND);
		$this->_magnet=array();
	}
	
}
//示例
$s = new Magnet('LOL','magnet.log',2,array(0,10));
$s->run();