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# http_cache_last_modified

(PECL)

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: This function may be used in conjunction with http_send_data(), http_send_file() e http_send_stream().

## Parâmetros

`timestamp_or_expires`

  Unix timestamp

## Valores de retornado

Returns `FALSE` or exits on success with `304 Not Modified` if the entity is cached. See the Definições INI http.force_exit for what "exits" means.

## 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()
the HttpResponse class if you are using PHP-5.1 and above

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