HTTP 函数
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http_cache_etag

(PECL pecl_http >= 0.1.0)

http_cache_etagCaching by ETag

说明

bool http_cache_etag ([ string $etag ] )

Attempts to cache the sent entity by its ETag, either supplied or generated by the hash algorithm specified by the INI 设定 http.etag.mode.

If the clients If-None-Match header matches the supplied/calculated ETag, the body is considered cached on the clients side and a 304 Not Modified status code is issued.

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

Note: This function may be used in conjunction with http_send_data(), http_send_file()http_send_stream().

If this function is used outside the http_send_*() API, it facilitates the ob_etaghandler().

参数

etag

custom ETag

返回值

Returns FALSE or exits on success with 304 Not Modified if the entity is cached. See the INI 设定 http.force_exit for what "exits" means.

范例

Example #1 A http_cache_etag() example

<?php
http_cache_etag
();
http_send_data("data");
?>

参见


HTTP 函数
php 手册 | 脚本学堂 | 脚本编程 | 网站编程 | 系统管理 | 服务器配置 | 数据库管理 | Php教程 | python教程 | 正则表达式 | 批处理脚本 | Centos教程 | Linux基础教程