The manual probably doesn't stress this enough:
** This has nothing to do with lifetime of a session **
Whatever you set this setting to, it won't change how long sessions live on your server.
This only changes HTTP cache expiration time (Expires: and Cache-Control: max-age headers), which advise browser for how long it can keep pages cached in user's cache without having to reload them from the server.
session_cache_expire
(PHP 4 >= 4.2.0, PHP 5, PHP 7)
session_cache_expire — 현재 캐시 만료를 반환
설명
int session_cache_expire
([ string
$new_cache_expire
] )session_cache_expire()는 session.cache_expire의 현재 설정을 반환합니다.
캐시 만료는 요청 시작시에 session.cache_limiter(기본값 180)로 초기화됩니다. 그러므로, 매 요청마다 (session_start() 호출 전에) session_cache_expire()를 호출해야 합니다.
인수
-
new_cache_expire -
new_cache_expire가 주어지면, 현재 캐시 만료가new_cache_expire로 교체됩니다.Note: session.cache_limiter가 nocache와 다른 값으로 설정되어 있을 경우에,
new_cache_expire는 값만 설정합니다.
반환값
현재 session.cache_expire 설정을 반환합니다. 반환하는 값은 분 단위로 읽으며, 기본값은 180입니다.
예제
Example #1 session_cache_expire() 예제
<?php
/* set the cache limiter to 'private' */
session_cache_limiter('private');
$cache_limiter = session_cache_limiter();
/* set the cache expire to 30 minutes */
session_cache_expire(30);
$cache_expire = session_cache_expire();
/* start the session */
session_start();
echo "The cache limiter is now set to $cache_limiter<br />";
echo "The cached session pages expire after $cache_expire minutes";
?>
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User Contributed Notes 2 notes
Anonymous ¶
16 years ago
tuncdan dot ozdemir dot peng at gmail dot com ¶
2 months ago
Using PHP 8.2
session_start();
$result1 = session_cache_expire( 30 ); // setter, results in Warning: Session cache expiration cannot be changed when a session is active in ...
$result2 = session_cache_expire(); // getter
var_dump( $result1, $result2 ); // prints out: int(180) int(180) [note: 180 is the default value]
Because the session was already started, cache expiration could not be changed (warning message). However, the return value is NOT false, it is still the original, unchanged value!
So I do not know what is considered a failure to change the value as per the documentation (`On failure to change the value, false is returned.`).
