http_cache_last_modified
(PECL pecl_http >= 0.1.0)
http_cache_last_modified — Caching by last modification
Descrierea
$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());
?>
A se vedea și
- http_cache_etag() - Caching by ETag
- clasa HttpResponse dacă utilizați PHP 5.1.0 sau ulterior
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