curl class encapsulation

<?php
/**
  * @author askwei 
**/
 
class CURL   
{  
    private $ch;  
    private $url = "http://www.baidu.com";
    private $flag_if_have_run;   //标记exec是否已经运行
    private $set_time_out = 20;  //设置curl超时时间
    private $cookie_file = "";  //cookie_file路径
    private $cookie_mode = 0;    //cookie保存模式 0不使用 1客户端、2服务器文件
    private $show_header = 0;    //是否输出返回头信息
    private $set_useragent = ""; //模拟用户使用的浏览器，默认为模拟
     
    //构造函数  
    public function __construct($url = ""){  
        $this->ch = curl_init();  
        $this->url = $url ? $url : $this->url;
        //$this->set_useragent = $_SERVER[&#39;HTTP_USER_AGENT&#39;]; // 模拟用户使用的浏览器   
        $this->set_useragent ="Mozilla/5.0 (iPhone; CPU iPhone OS 6_1_4 like Mac OS X) AppleWebKit/536.26 (KHTML, like Gecko) Version/7.0 Mobile/10B350 Safari/9537.53";
        // $this->set_useragent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.143 Safari/537.36";
        //$this->cookie_file=dirname(__FILE__)."/cookie_".md5(basename(__FILE__)).".txt";    //初始化cookie文件路径 
        //$this->cookie_file= SAE_TMP_PATH.TmpFS;
        $this->cookie_file = "saekv://cookie_2014.txt";
    }  
    //关闭curl
    public function close(){  
        curl_close($this->ch);  
    }  
    //析构函数  
    public function __destruct(){  
        $this->close();  
    }  
     
   //设置超时   
    public function set_time_out($timeout=20){  
        if(intval($timeout) != 0)       
        $this->set_time_out = $timeout;
        return $this;
    }  
    //设置来源页面  
    public function set_referer($referer = ""){  
        if (!empty($referer))  
            curl_setopt($this->ch, CURLOPT_REFERER , $referer);  
        return $this;  
    }
    //设置cookie存放模式 1客户端、2服务器文件  
    public function set_cookie_mode($mode = ""){  
        $this->cookie_mode = $mode;
        return $this;
    }
    //载入cookie  
    public function load_cookie(){  
     
        if($this->cookie_mode == 1 ) {
            if(isset($_COOKIE[&#39;curl&#39;])){
                curl_setopt($this->ch,CURLOPT_COOKIE,$_COOKIE[&#39;curl&#39;]);
            }else{
                $this->exec();
                curl_setopt($this->ch,CURLOPT_COOKIE,$this->cookie_file);
            }
             
        }
        if($this->cookie_mode == 2 ) {
           
            curl_setopt($this->ch, CURLOPT_COOKIEFILE , $this->cookie_file);
             
        }
        if($this->cookie_mode == 3 ) {
            $kv = new SaeKV();
            $ret = $kv->init();
            $ret = $kv->get(&#39;curl_cookie&#39;);
            if($ret)
               curl_setopt($this->ch,CURLOPT_COOKIE, $ret);
             
        }
        return $this;  
    }  
    
    //设置保存cookie方式 $cookie_val 模式1为变量 模式2为文件路径
    public function save_cookie($cookie_val = "") {  
        //保存在客户端
        if($this->cookie_mode == 1 && $cookie_val){
           setcookie(&#39;curl&#39;,$cookie_val); 
        }
        //保存服务器端
        if($this->cookie_mode == 2){ 
            if(!empty($cookie_val))  
               $this->cookie_file =  $cookie_val;
            curl_setopt($this->ch, CURLOPT_COOKIEJAR , $this->cookie_file);  
        }
        //保存在sae
        if($this->cookie_mode == 3 && $cookie_val){
             $kv = new SaeKV();
             $ret = $kv->init();
             $ret = $kv->get(&#39;curl_cookie&#39;);
            if($ret){
                $ret = $kv->set(&#39;curl_cookie&#39;, $cookie_val );
                 
            }else{
                 $ret = $kv->add(&#39;curl_cookie&#39;, $cookie_val);
             
            }
        }
         
         
        return $this;  
         
    }  
    //post参数 (array) $post 
    public function post ($post = ""){  
        if($post && is_array($post)){
            curl_setopt($this->ch, CURLOPT_POST , 1);  
            curl_setopt($this->ch, CURLOPT_POSTFIELDS , $post );  
        }
        return $this;  
    }  
    //设置代理 ,例如&#39;68.119.83.81:27977&#39;  
    public function set_proxy($proxy = ""){
        if($proxy){ 
            curl_setopt($this->ch, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);  
            curl_setopt($this->ch, CURLOPT_PROXY,$proxy); 
        }           
        return $this;  
    }  
    //设置伪造ip  
    public function set_ip($ip=""){  
        if(!empty($ip))  
            curl_setopt($this->ch, CURLOPT_HTTPHEADER, array("X-FORWARDED-FOR:$ip", "CLIENT-IP:$ip"));  
        return $ip;  
    } 
     //设置是否显示返回头信息
    public function show_header($show=0){
        $this->show_header = 0;  
        if($show) 
            $this->show_header = 1; 
        return $this;  
    }
 
     //设置请求头信息
    public function set_useragent($str=""){  
        if($str)  
            $this->set_useragent = $str;  
        return $this;  
    }   
     
    //执行  
    public function exec ($url = ""){  
        if(!$url) $url = $this->url;
        curl_setopt($this->ch, CURLOPT_URL, $url); // 要访问的地址
        curl_setopt($this->ch, CURLOPT_SSL_VERIFYPEER, 0); // 对认证证书来源的检查   
        curl_setopt($this->ch, CURLOPT_RETURNTRANSFER , 1 );    //获取的信息以文件流的形式返回     
        curl_setopt($this->ch, CURLOPT_SSL_VERIFYHOST, 1); // 从证书中检查SSL加密算法是否存在 
         curl_setopt($this->ch, CURLOPT_USERAGENT, $this->set_useragent); // 模拟用户使用的浏览器      
        curl_setopt($this->ch, CURLOPT_FOLLOWLOCATION, 1); // 使用自动跳转      
        curl_setopt($this->ch, CURLOPT_AUTOREFERER, 1); // 自动设置Referer 
        curl_setopt($this->ch, CURLOPT_TIMEOUT, $this->set_time_out);  //超时设置
        curl_setopt($this->ch, CURLOPT_HEADER, $this->show_header); // 显示返回的Header区域内容
        curl_setopt($this->ch, CURLOPT_NOBODY, 0);//不返回response body内容 
         
        $res = curl_exec($this->ch);
        $this->flag_if_have_run = true;
        if (curl_errno($this->ch)) {      
            //echo &#39;Errno&#39;.curl_error($this->ch);  
            return false;           
        } 
        if($this->show_header == 1){ //数组形式返回头信息和body信息 
            list($header, $body) = explode("\r\n\r\n", $res);
            $arr[&#39;header&#39;] = $header;
            $arr[&#39;body&#39;] = $body;
            if($this->cookie_mode == 1 || $this->cookie_mode == 3){  
                preg_match_all("/set\-cookie:([^\r\n]*)/i", $header, $matches);
                //print_r($matches);
                if($matches && isset($matches[1]) ){
                    $val = implode(&#39;;&#39;,array_unique(explode(&#39;;&#39;,implode(&#39;;&#39;,$matches[1])))); //去重处理
                    if($val)
                      $this->save_cookie($val); //设置客户端保存cookie
                }
            }
            if($arr) return $arr;
        }
         
        return $res;  
    }  
     
     
    //返回  curl_getinfo信息
    public function get_info(){  
        if($this->flag_if_have_run == true )  
            return curl_getinfo($this->ch);  
        else  
            throw new Exception("<h1>需先运行( 执行exec )，再获取信息</h1>");  
    }  
      
}  
?>