http_cache_last_modified

(PECL pecl_http >= 0.1.0)

http_cache_last_modified — Caching by last modification

Beschreibung

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

Hinweis: Diese Funktion kann zusammen mit http_send_data(), http_send_file() und http_send_stream() benutzt werden.

Parameter-Liste

timestamp_or_expires: Unix timestamp

Rückgabewerte

Liefert FALSE oder beendet bei Erfolg with 304 Not Modified if the entity is cached. INI-Einstellungen http.force_exit beschreibt, was "exits" bedeutet.

Beispiele

Beispiel #1 A http_cache_last_modified() example

Caching for 5 seconds.


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

Siehe auch

http_cache_etag() - Caching by ETag
die HttpResponse-Klasse, wenn sie PHP 5.1 oder höher benutzen