http_cache_etag
http_chunked_decode
Funções para HTTP
PHP Manual

# http_cache_last_modified

(PECL pecl_http >= 0.1.0)

http_cache_last_modified — Caching by last modification

### Descrição

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

> Nota: Esta função pode ser usada em conjunto com http_send_data(), http_send_file() e http_send_stream().

### Parâmetros

`timestamp_or_expires`

  Unix timestamp

### Valor Retornado

Retorna `FALSE` ou exits em caso de sucesso with 304 Not Modified if the entity is cached. Veja a Definições INI http.force_exit para saber o que "exits" significa.

### Exemplos

Exemplo #1 A http_cache_last_modified() example

Caching for 5 seconds.

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

### Veja Também

- http_cache_etag() - Caching by ETag
- a classe HttpResponse se você esta usando o PHP 5.1 e acima

http_cache_etag
http_chunked_decode
Funções para HTTP
PHP Manual