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/**
 * 下载远程图片到本地
 *
 * @param $url string 远程文件地址
 * @param $filename string 保存后的文件名(为空时则为随机生成的文件名,否则为原文件名)
 * @param $fileType array 允许的文件类型
 * @param $dirName string 文件保存的路径(路径其余部分根据时间系统自动生成)
 * @param $type int 远程获取文件的方式
 * @return json 返回文件名、文件的保存路径
 * @author www.phpxs.com
 */
function download_image($url, $fileName = '', $dirName, $fileType = array('jpg', 'gif', 'png'), $type = 1)
{
    if ($url == '')
    {
        return false;
    }
 
    // 获取文件原文件名
    $defaultFileName = basename($url);
 
    // 获取文件类型
    $suffix = substr(strrchr($url, '.'), 1);
    if (!in_array($suffix, $fileType))
    {
        return false;
    }
 
    // 设置保存后的文件名
    $fileName = $fileName == '' ? time() . rand(0, 9) . '.' . $suffix : $defaultFileName;
 
    // 获取远程文件资源
    if ($type)
    {
        $ch = curl_init();
        $timeout = 30;
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
        $file = curl_exec($ch);
        curl_close($ch);
    }
    else
    {
        ob_start();
        readfile($url);
        $file = ob_get_contents();
        ob_end_clean();
    }
 
    // 设置文件保存路径
    //$dirName = $dirName . '/' . date('Y', time()) . '/' . date('m', time()) . '/' . date('d', time());
    $dirName = $dirName . '/' . date('Ym', time());
    if (!file_exists($dirName))
    {
        mkdir($dirName, 0777, true);
    }
 
    // 保存文件
    $res = fopen($dirName . '/' . $fileName, 'a');
    fwrite($res, $file);
    fclose($res);
 
    return array(
        'fileName' => $fileName,
        'saveDir' => $dirName
    );
    }
/**
 * 批量下载博客中的图片到本地
 */
public function index()
{
    global $_G;
 
    $blogModel = model('Blog', 'blog');
    $list = $blogModel->order('gid desc')->limit(10)->findPage();
 
    $page = get_gpc('page') ? get_gpc('page') : 1;
    $totalPages = $list['totalPages'];
    $page = $page + 1;
 
    if ($page > $totalPages)
    {
        die('更新完毕!');
    }
 
    foreach ($list['data'] as $val)
    {
        $content = $val['content'];
        $excerpt = $val['excerpt'];
 
        $_G['isContentUpdate'] = $_G['isExcerptUpdate'] = false;
 
        /* 内容 */
        $content = preg_replace_callback("/src=\"(http:\/\/images\.cnblogs\.com\/cnblogs_com[^\"]+)\"/", function($matches) {
 
            global $_G;
            $_G['isContentUpdate'] = true;
 
            // 下载远程图片到本地
            $res = download_image($matches[1], 'old', 'd:/PHP/xampp/htdocs/emlog/content/uploadfile');
 
            // 返回 下载后的图片url地址
            return 'src="/content/uploadfile/' . date('Ym', time()) . '/' . $res['fileName'] . '"';
 
        }, $content);
 
        /* 摘要 */
        $excerpt = preg_replace_callback("/src=\"(http:\/\/images\.cnblogs\.com\/cnblogs_com[^\"]+)\"/", function($matches) {
 
            global $_G;
            $_G['isExcerptUpdate'] = true;
 
            // 下载远程图片d到本地
            $res = download_image($matches[1], 'old', 'd:/PHP/xampp/htdocs/emlog/content/uploadfile');
 
            // 返回 下载后的图片url地址
            return 'src="/content/uploadfile/' . date('Ym', time()) . '/' . $res['fileName'] . '"';
 
        }, $excerpt);
 
        /* 更新数据库 */
        $where = array(
            'gid' => $val['gid']
        );
        $data = array();
 
        if ($_G['isContentUpdate'])
        {
            $data['content'] = $content;
        }
 
        if ($_G['isExcerptUpdate'])
        {
            $data['excerpt'] = $excerpt;
        }
 
        if ($data)
        {
            $blogModel->where($where)->save($data);
        }
    }
 
    /* 更新下一页 */
    $url = url('blog/Main/index', array('page' => $page));
    $msg = '正在更新' . $page . '/' . $totalPages;
    redirect($url, 2, $msg);
}


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