Last updated: Fri, 20 Nov 2009

http_cache_etag

(PECL pecl_http >= 0.1.0)

http_cache_etag — Caching by ETag

Descrierea

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 setarea INI 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 setarea INI http.log.cache is set and the cache attempt was successful.

Notă: Această funcţie ar putea fi utilizată împreună cu http_send_data(), http_send_file() şi http_send_stream().

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

Parametri

etag: custom ETag

Valorile întroarse

Întoarce FALSE sau iese în caz de succes with 304 Not Modified if the entity is cached. Vedeţi setarea INI http.force_exit pentru a afla ce înseamnă "iese".

Exemple

Example #1 A http_cache_etag() example


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

Vedeţi de asemenea

http_cache_last_modified() - Caching by last modification
ob_etaghandler() - ETag output handler
http_match_etag() - Match ETag
clasa HttpResponse dacă utilizaţi PHP 5.1.0 sau ulterior

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http_cache_last_modified

HTTP Funcţii

Last updated: Fri, 20 Nov 2009