HTTP 함수 목록
http_cache_last_modified
HTTP 함수 목록
PHP Manual

# http_cache_etag

(PECL pecl_http >= 0.1.0)

http_cache_etag — Caching by ETag

### 설명

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

> Note: 이 함수는 다음 함수와 함께 사용할 수 있습니다: http_send_data(), http_seld_file() 그리고 http_send_stream().

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

### 인수

`etag`

  custom ETag

### 반환값

성공시 `FALSE`를 반환하거나 종료합니다. with 304 Not Modified if the entity is cached. "exits"의 의미에 대해서 INI 설정 http.force_exit를 참고하십시오.

### 예제

Example #1 A http_cache_etag() example

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

### 참고

- http_cache_last_modified() - Caching by last modification
- ob_etaghandler() - ETag output handler
- http_match_etag() - Match ETag
- PHP 5.1.0 이상을 사용할 때 HttpResponse 클래스

HTTP 함수 목록
http_cache_last_modified
HTTP 함수 목록
PHP Manual