http_cache_last_modified

(PECL pecl_http >= 0.1.0)

http_cache_last_modified — Caching by last modification

Descrição

bool http_cache_last_modified ([ int $timestamp_or_expires ] )

Attempts to cache the sent entity by its last modification date.

If the supplied argument is greater than 0, it is handled as timestamp and will be sent as date of last modification. If it is 0 or omitted, the current time will be sent as Last-Modified date. If it's negative, it is handled as expiration time in seconds, which means that if the requested last modification date is not between the calculated timespan, the Last-Modified header is updated and the actual body will be sent.

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

Nota: Esta função pode ser usada em conjunto com http_send_data(), http_send_file() e http_send_stream().

Parâmetros

timestamp_or_expires: Unix timestamp

Valor Retornado

Retorna FALSE ou exits em caso de sucesso with 304 Not Modified if the entity is cached. Veja a Definições INI http.force_exit para saber o que "exits" significa.

Exemplos

Exemplo #1 A http_cache_last_modified() example

Caching for 5 seconds.


<?php
http_cache_last_modified(-5);
printf("%s\n", http_date());
?>

Veja Também

http_cache_etag() - Caching by ETag
a classe HttpResponse se você esta usando o PHP 5.1 e acima

add a note User Contributed Notes http_cache_last_modified

from dot php dot net at brainbox dot cz 22-Feb-2011 07:18


Please note that calling this function automatically sends also following header:



Cache-Control: private, must-revalidate, max-age=0



If you want to modify the Cache-Control header as well, you must send it *after* calling http_cache_last_modified().

add a note