/**
* Sets the number of seconds after the time specified in the response's Date
* header when the the response should no longer be considered fresh.
*
* First, it checks for a s-maxage directive, then a max-age directive, and then it falls
* back on an expires header. It returns null when no maximum age can be established.
*
* @return integer|null Number of seconds
*/
public function getMaxAge()
{
if ($age = $this->headers->getCacheControlDirective('s-maxage')) {
return $age;
}
if ($age = $this->headers->getCacheControlDirective('max-age')) {
return $age;
}
if (null !== $this->getExpires()) {
return $this->getExpires()->format('U') - $this->getDate()->format('U');
}
return null;
}
public function testCacheControlDirectiveOverrideWithReplace()
{
$bag = new HeaderBag(array('cache-control' => 'private, max-age=100'));
$bag->replace(array('cache-control' => 'public, max-age=10'));
$this->assertTrue($bag->hasCacheControlDirective('public'));
$this->assertTrue($bag->getCacheControlDirective('public'));
$this->assertTrue($bag->hasCacheControlDirective('max-age'));
$this->assertEquals(10, $bag->getCacheControlDirective('max-age'));
}