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PHP5中文手册
HTTP
PHP Manual

http_cache_etag

(PECL pecl_http:0.1.0-1.5.5)

http_cache_etag — Caching 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() 和 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
PHP Manual