HTTP 函数
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http_cache_last_modified

(PECL pecl_http >= 0.1.0)

http_cache_last_modifiedCaching by last modification

说明

bool http_cache_last_modified ([ int $timestamp_or_expires ] )

Attempts to cache the sent entity by its last modification date.

If the supplied argument is greater than 0, it is handled as timestamp and will be sent as date of last modification. If it is 0 or omitted, the current time will be sent as Last-Modified date. If it's negative, it is handled as expiration time in seconds, which means that if the requested last modification date is not between the calculated timespan, the Last-Modified header is updated and the actual body will be sent.

A log entry will be written to the cache log if the INI 设置 http.log.cache is set and the cache attempt was successful.

Note: 此函数可与 http_send_data(), http_send_file()http_send_stream() 一同使用。

参数

timestamp_or_expires

Unix timestamp

返回值

返回 FALSE 或在成功时返回出口信息 with 304 Not Modified if the entity is cached. 要知道“出口”的含义请查阅 INI 设置 http.force_exit

范例

Example #1 A http_cache_last_modified() example

Caching for 5 seconds.

<?php
http_cache_last_modified
(-5);
printf("%s\n"http_date());
?>

参见


HTTP 函数
在线手册:中文 英文
PHP手册
PHP手册 - N: Caching by last modification

用户评论:

from dot php dot net at brainbox dot cz (22-Feb-2011 03:18)

Please note that calling this function automatically sends also following header:

Cache-Control: private, must-revalidate, max-age=0

If you want to modify the Cache-Control header as well, you must send it *after* calling http_cache_last_modified().