1. 判断文件是否存在
2. 通过curl方式获取指定的图片到本地
3. 判断终端设备
4. 模拟发送http请求
5. 生成6位验证码
6. 根据间戳返回星期几
7. 数字转换成汉字
8. 把图片转换成base64码

/**
 * 功能：判断文件是否存在
 * @param $url
 * @return int
 */
public function img_exits($url){
    if(@fopen($url, 'r')) {
        //echo '文件存在';
        return true;
    } else {
        //echo '文件不存在';
        return false;
    }
}


/*
  *@ 通过curl方式获取指定的图片到本地
  *@ 完整的图片地址
  *@ 要存储的文件名
 */
public function GrabImage($url = "", $filename = "") {
    //去除URL连接上面可能的引号
    //$url = preg_replace( '/(?:^['"]+|['"/]+$)/', '', $url );
    $hander = curl_init();
    $fp = fopen("uploads/poster/".$filename,'wb');
    curl_setopt($hander,CURLOPT_URL,$url);
    curl_setopt($hander,CURLOPT_FILE,$fp);
    curl_setopt($hander,CURLOPT_HEADER,0);
    curl_setopt($hander,CURLOPT_FOLLOWLOCATION,1);
    //curl_setopt($hander,CURLOPT_RETURNTRANSFER,false);//以数据流的方式返回数据,当为false是直接显示出来
    curl_setopt($hander,CURLOPT_TIMEOUT,60);
    curl_exec($hander);
    curl_close($hander);
    fclose($fp);
    return  true;
}



/**
 * 功能：判断终端设备
 */
public function ismod() {
    $agent= $_SERVER['HTTP_USER_AGENT'];
    if(strpos($agent,"iPad")){
        //iPad
        //header("Location: http://www.itxwzj.com");
    }else if(strpos($agent,"NetFront") || strpos($agent,"iPhone") || strpos($agent,"MIDP-2.0") || strpos($agent,"Opera Mini") || strpos($agent,"UCWEB") || strpos($agent,"Android") || strpos($agent,"Windows CE") || strpos($agent,"SymbianOS")){
        //手机
        header("Location: http://m.itxwzj.com);
    }else{
        //电脑
        //header("Location: http://www.itxwzj.com");
    }
}



/**
 * 功能：模拟发送http请求
 * @access  public
 * @param type $url
 * @param type $params
 * @param type $method
 * @param type $header
 * @param type $multi
 * @return type
 */
public function http($url, $params, $method = 'GET', $header = array(), $multi = false) {
    $opts = array(
        CURLOPT_TIMEOUT => 30,
        CURLOPT_RETURNTRANSFER => 1,
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_SSL_VERIFYHOST => false,
        CURLOPT_HTTPHEADER => $header
    );
    switch (strtoupper($method)) {
        case 'GET':
            $opts[CURLOPT_URL] = $url . '?' . http_build_query($params);          //对参数进行U编辑
            //$opts[CURLOPT_URL] = $url . '?' . iconv("UTF-8", "gbk//TRANSLIT", urldecode(http_build_query($params)));
            break;
        case 'POST':
            $params = $multi ? $params : http_build_query($params);
            $opts[CURLOPT_URL] = $url;
            $opts[CURLOPT_POST] = 1;
            $opts[CURLOPT_POSTFIELDS] = $params;
            break;
        default:
            E('不支持的请求方式！');
    }
    $ch = curl_init();
    curl_setopt_array($ch, $opts);
    $data = curl_exec($ch);
    $error = curl_error($ch);
    curl_close($ch);
    if ($error)
        exit('请求发生错误：' . $error);
    return $data;
}



/**
 * 功能：生成6位验证码
 * @param unknown $length
 * @return string
 */
public function generate_code($length) {
    return str_pad(mt_rand(0, pow(10, $length) - 1), $length, '0', STR_PAD_LEFT);
}



/**
 * 功能：根据时间戳返回星期几
 * @param string $time 时间戳
 * @return 星期几
 */
public function weekday($time) {
    if (is_numeric($time)) {
        $weekday = array('星期日', '星期一', '星期二', '星期三', '星期四', '星期五', '星期六');
        return $weekday[date('w', $time)];
    }
    return false;
}

/**
 * 功能：数字转换成汉字
 * @param type $number
 * @return string
 */
public function daxie($number) {
    $number = substr($number, 0, 2);
    $arr = array("零", "一", "二", "三", "四", "五", "六", "七", "八", "九");
    if (strlen($number) == 1) {
        $result = $arr[$number];
    } else {
        if ($number == 10) {
            $result = "十";
        } else {
            if ($number < 20) {
                $result = "十";
            } else {
                $result = $arr[substr($number, 0, 1)] . "十";
            }
            if (substr($number, 1, 1) != "0") {
                $result.=$arr[substr($number, 1, 1)];
            }
        }
    }
    return $result;
}



/**
 * 功能：把图片转换成base64码
 * @param string $img
 * @return string
 */
 function enbase64($img){
        $img = './front/commonImg/load_def.jpg';
        $str = file_get_contents($img);
        return base64_encode($str);
 }