http_cache_last_modified

(PECL pecl_http >= 0.1.0)

http_cache_last_modified — Caching by last modification

Opis

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

Informacja: Ta funkcja może być użyta w powiązaniu z http_send_data(), http_send_file() i http_send_stream().

Parametry

timestamp_or_expires: Unix timestamp

Zwracane wartości

Zwraca FALSE lub exist w przypadku sukcesu with 304 Not Modified if the entity is cached. Patrz ustawienia INI http.force_exit co znaczą "exist".

Przykłady

Przykład #1 A http_cache_last_modified() example

Caching for 5 seconds.


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

Zobacz też:

http_cache_etag() - Caching by ETag
Klasa HttpResponse jeśli używasz PHP 5.1.0 lub późniejszego

add a note User Contributed Notes http_cache_last_modified - [1 notes]

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from dot php dot net at brainbox dot cz ¶

2 years ago


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().

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