Last updated: Fri, 18 Sep 2009

http_cache_etag

(PECL pecl_http >= 0.1.0)

http_cache_etag — Caching by ETag

Описание

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 настройка 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 настройка http.log.cache is set and the cache attempt was successful.

Забележка: Тази функция може да се използва в комбинация с http_send_data(), http_send_file() и http_send_stream().

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

Параметри

etag: custom ETag

Връщани стойности

Връща FALSE или излиза при успех with 304 Not Modified if the entity is cached. Вижте INI настройка http.force_exit за да разберете какво означава "излиза".

Примери

Example #1 A http_cache_etag() example


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

Вж. също

http_cache_last_modified() - Caching by last modification
ob_etaghandler() - ETag output handler
http_match_etag() - Match ETag
класът HttpResponse, ако използвате PHP 5.1.0 или по-нова

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http_cache_last_modified

HTTP Функции

Last updated: Fri, 18 Sep 2009