session_cache_limiter() 返回当前缓存限制的名字. 如果指定了 cache_limiter, 当前的缓存限制的名字被改为新值.
缓存限制控制着 http 头发送到客户端的缓存控制. 这些确定页面内容规则的头内容可以被缓存.如果设置缓存设置为没有缓存(nocache), 将不允许任何客户端缓存. 但是公共变量可以允许缓存. 他也可以设置为私有的,这个比公共的多一点限制.
缓存显示在请求开始时被重新设置为 session_cache_limiter 的默认值.这样,你需要在每次请求时调用 session_cache_limiter() for every request (在 session_start() 调用前).
设置cache限制为 private
- */
- session_cache_limiter('private');
- $cache_limiter=session_cache_limiter();
- /*设置session的过期时间为30秒*/
- session_cache_expire(30);
- $cache_expire=session_cache_expire();
- /*初始化session*/
- session_start();
- /*输出结果内容*/
- echo "当前的session cache限制被设置为:$cache_limiter<br />";
- echo "当前的session过期时间为:$cache_expire minutes";
- /*
- 输出结果为:
- the cache limiter is now set to private
- the cached session pages expire after 30 minutes
- */
- //实例二
- /*设置caceh限制者为'private'*/
- session_cache_limiter('private');
- /*返回caceh限制者*/
- $cache_limiter=session_cache_limiter();
- echo "当前的session cache限制被设置为:$cache_limiter<br />";
- //实例三
- $filename="test.mpeg";
- $filepath="test.mpeg";
- session_start();
- /*初始化session*/
- session_commit();
- /*输出请求的文件*/
- header("content-type: audio/x-mpeg"); //或者其他类型的文件
- header("content-disposition:attachment;filename=".$filename);
- header("content-length:".$filesize);
- header("content-transfer-encoding:binarynn");
- header("pragma:no-cache");
- header("expires:0");
- $file_contents=file_get_contents($filepath);
- print($file_contents
- );
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波比源码 » php session_cache_limiter session_cache_expire等函数
波比源码 » php session_cache_limiter session_cache_expire等函数
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