session_cache_limiter

Function name: session_cache_limiter()

Function description: The session_cache_limiter() function is used to obtain or set the cache limiter for the current session.

usage:

1. Get the cache limiter for the current session: string session_cache_limiter ( void )

2. Set the cache limiter for the current session: bool session_cache_limiter ( string $cache_limiter )

parameter:

• $cache_limiter: Optional parameter, indicating the cache limiter to be set. The optional values ​​include the following:
  • 'nocache': Disable caching.
  • 'public': Allow public caching.
  • 'private': Only private caches are allowed.
  • 'private_no_expire': Allow private cache, but expires.
  • 'must-revalidate': The cache must be reverified.
  • 'proxy-revalidate': The proxy server must reverify the cache.

Return value:

• When obtaining the cache limiter, returns the cache limiter string for the current session.
• When setting the cache limiter, return the Boolean value of successful or not.

Example:

1. Get the cache limiter for the current session:

    $cache_limiter = session_cache_limiter(); echo "当前会话的缓存限制器为：".$cache_limiter;

   Output:

   当前会话的缓存限制器为：nocache

2. Set the cache limiter for the current session to 'private':

    $result = session_cache_limiter('private'); if ($result) { echo "设置缓存限制器成功！"; } else { echo "设置缓存限制器失败！"; }

   Output:

   设置缓存限制器成功！

Notes:

• The session_cache_limiter() function must be called before the session_start() function, otherwise the set cache limiter may not take effect.
• When modifying the cache limiter, it is recommended to set it at the top of each page to ensure it takes effect.