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<?php
    $str = file_get_contents('http://cn.bing.com/HPImageArchive.aspx?idx=0&n=1');
    if (preg_match("/<url>(.+?)<\/url>/ies", $str, $matches)) { 
        $imgurl = 'http://cn.bing.com' . $matches[1];
    } else {
        $imgurl = '修改为你自己的默认图片地址';
    }
    header("Location: $imgurl");