HttpResponse::setCacheControl

(PECL pecl_http >= 0.10.0)

HttpResponse::setCacheControl — Set cache control

static bool HttpResponse::setCacheControl ( string $control [, int $max_age= 0 [, bool $must_revalidate= true ]] )

Define a custom Cache-Control header, usually being private or public;

control: the primary cache control setting
max_age: the max-age in seconds, suggesting how long the cache entry is valid on the client side
must_revalidate: whether the cached entity should be revalidated by the client for every request

Returns TRUE on success, or FALSE if control does not match one of public, private or no-cache.