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php怎么通过一个Url获得文件类型(后缀名)?

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Release: 2016-06-06 20:39:03
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网上找的方法都是知道文件后缀名的情况下~
我现在的情况是只知道Url,比如http://site.com/photo,这是一个文件,但是没有把文件类型和后缀在上面表示出来,我接收到之后怎么用Php把他后缀或者文件类型获取到?

好吧,我是做微信的时候用户发过来的图片腾讯只给了我一个这样的url

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网上找的方法都是知道文件后缀名的情况下~
我现在的情况是只知道Url,比如http://site.com/photo,这是一个文件,但是没有把文件类型和后缀在上面表示出来,我接收到之后怎么用Php把他后缀或者文件类型获取到?

好吧,我是做微信的时候用户发过来的图片腾讯只给了我一个这样的url

http://php.net/manual/en/function.finfo-buffer.php

php怎么通过一个Url获得文件类型(后缀名)?

大家写的代码很不高效呀

<code><?php echo `curl -Is 'http://s11.sinaimg.cn/mw690/e0571d75tx6Co4vJcUOfa&690' |grep "Content-Type:"`;
</code></code>
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http://stackoverflow.com/questions/2610713/get-mime-type-of-external-file-using-curl-and-php

你应该通过 HTTP 头部里面的 Content-Type 来判断数据类型。

CodeIgniter 提供了一份比较完整的 Content-Type(即 MIME Type)和扩展名的对应表,你可以参考一下。

https://github.com/bcit-ci/CodeIgniter/blob/master/application/config/mimes.php

heheheh 玻璃心犯了

高端逼们,玩好不送!!

<code>function online_filetype($url) {
    if (function_exists('curl_init'))
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_HEADER, 1);
        curl_setopt($ch, CURLOPT_NOBODY, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        $results = explode("\n", trim(curl_exec($ch)));
        foreach($results as $line) {
                if (strtok($line, ':') == 'Content-Type') {
                        $parts = explode(":", $line);
                        return trim($parts[1]);
                }
        }
    }else
    {
        $url = parse_url($url);
        if ($fp = @fsockopen($url['host'], empty($url['port']) ? 80 : $url['port'], $error)) {
            fputs($fp, "GET " . (empty($url['path']) ? '/' : $url['path']) . " HTTP/1.1\r\n");
            fputs($fp, "Host: {$url['host']}\r\n\r\n");
            while (!feof($fp)) {
                $tmp = fgets($fp);
                if (trim($tmp) == '') {
                    break;
                } else if (preg_match('/Content-Type:(.*)/si', $tmp, $arr)) {
                    return trim((string)$arr[1]);
                }
            }
            return null;
        } else {
            return null;
        }
    }
    return null;
}
</code>
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