php 有没有办法告诉 curl 不使用缓存
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Is there a way to tell curl to not use cache
提问by Edgar
I am trying to find out file size of an url:
我试图找出一个 url 的文件大小：
$url1 = 'www.google.com';
$curl1 = curl_init();
curl_setopt($curl1, CURLOPT_URL, $url1);
curl_setopt($curl1, CURLOPT_RETURNTRANSFER, TRUE);
curl_exec($curl1);
$file_size = curl_getinfo($curl1, CURLINFO_SIZE_DOWNLOAD );
$file_size_kb = $file_size / 1000;
echo $file_size_kb;
The output is 43331. I think its too low because i have google cached. Can this be true? Also i tested google on some other site that calculates size of url, and it was twice as big.
输出是43331。我认为它太低了，因为我有谷歌缓存。这是真的吗？我也在其他一些计算 url 大小的网站上测试了谷歌，它是两倍大。
回答by Olaf Dietsche
You can use CURLOPT_FRESH_CONNECTfor this. From curl_setopt
您可以CURLOPT_FRESH_CONNECT为此使用。从curl_setopt
CURLOPT_FRESH_CONNECTTRUE to force the use of a new connection instead of a cached one.
CURLOPT_FRESH_CONNECTTRUE 强制使用新连接而不是缓存连接。
curl_setopt($curl1, CURLOPT_FRESH_CONNECT, TRUE);
回答by Subodh Ghulaxe
curl_setopt($curl1, CURLOPT_FRESH_CONNECT, 1); // don't use a cached version of the url
curl_setopt($curl1, CURLOPT_FRESH_CONNECT, 1); // 不要使用缓存版本的 url
CURLOPT_FRESH_CONNECT TRUE to force use of a new connection instead of a cached one.
check example here
在此处检查示例
you can set header
你可以设置标题
$headers = array(
?? ? ? ? ?? "Cache-Control: no-cache",
?? ? ? ? ?? );
curl_setopt($curl1, CURLOPT_HTTPHEADER, $headers);
this link may be helpful to you http://www.php.net/manual/en/function.curl-setopt.php#96903
此链接可能对您有所帮助http://www.php.net/manual/en/function.curl-setopt.php#96903
回答by Mike Walkowiak
The best way to avoid caching is applying the time or any other random element to the url, like this:$url .= '?ts=' . time();
避免缓存的最佳方法是将时间或任何其他随机元素应用于 url，如下所示：$url .= '?ts=' . time();
so for example instead of havinghttp://example.com/content.php
you would havehttp://example.com/content.php?ts=1212434353
所以例如，而不是让http://example.com/content.php
你有http://example.com/content.php?ts=1212434353
回答by Dead Man
You can tell CURLto use fresh data by setting CURLOPT_FRESH_CONNECTto TRUE
您可以CURL通过设置CURLOPT_FRESH_CONNECT为使用新数据TRUE
You can read more about CURLfunction here :
您可以CURL在此处阅读有关功能的更多信息：
回答by Tony Stark
Use CURLOPT_FRESH_CONNECT- TRUE to force the use of a new connection instead of a cached one.
使用CURLOPT_FRESH_CONNECT- TRUE 强制使用新连接而不是缓存连接。
Example:
例子：
<?php
function check_url($url) {
$c = curl_init();
curl_setopt($c, CURLOPT_URL, $url);
curl_setopt($c, CURLOPT_HEADER, 1); // get the header
curl_setopt($c, CURLOPT_NOBODY, 1); // and *only* get the header
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1); // get the response as a string from curl_exec(), rather than echoing it
curl_setopt($c, CURLOPT_FRESH_CONNECT, 1); // don't use a cached version of the url
if (!curl_exec($c)) { return false; }
$httpcode = curl_getinfo($c, CURLINFO_HTTP_CODE);
return ($httpcode < 400);
}
?>
for more details about curl check out http://php.net/manual/en/function.curl-setopt.php
有关 curl 的更多详细信息，请查看http://php.net/manual/en/function.curl-setopt.php
may this help you.
可能这对你有帮助。
