http_cache_last_modified

(PECL pecl_http >= 0.1.0)

http_cache_last_modified — Caching by last modification

Descrierea

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

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

Parametri

timestamp_or_expires: Unix timestamp

Valorile întoarse

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

Exemple

Example #1 A http_cache_last_modified() example

Caching for 5 seconds.


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

Vedeți de asemenea

http_cache_etag() - Caching by ETag
clasa HttpResponse dacă utilizați PHP 5.1.0 sau ulterior

add a note User Contributed Notes http_cache_last_modified

from dot php dot net at brainbox dot cz 22-Feb-2011 12:18


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