(PECL pecl_http >= 0.1.0)
http_cache_last_modified — Caching by last modification
$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 impostazioni INI http.log.cache is set and the cache attempt was successful.
Nota: Questa funzione può essere usata con le funzioni http_send_data(), http_send_file() e http_send_stream().
timestamp_or_expiresUnix timestamp
Restituisce FALSE oppure esce in caso di successo with 304 Not Modified if the entity is cached.
Vedere impostazioni INI
http.force_exit per il significato di "uscita".
Example #1 A http_cache_last_modified() example
Caching for 5 seconds.
<?php
http_cache_last_modified(-5);
printf("%s\n", http_date());
?>