It's a default value in case of a miss - it's there mainly to support an
edge-case where someone is caching NULL values, and might need to pass a
different default value, so they can tell the difference between a cached
NULL-value and an actual miss.
So in your case:
$default = new stdClass(); // unique object representing a cache-miss
$myValue = $myCache->get('foo', $default); // might return a cached NULL
if ($myValue === $default) { // definitely a cache-miss
$myValue = someExpensiveOperation(); // might return NULL
$myCache->set('foo', $myValue); // might cache a NULL
}
At least that's my understanding.
On Wed, Mar 15, 2017 at 3:22 PM, Brad Kent <kent.b...@gmail.com> wrote:
> I know I'm late to the party, but what's the use-case for passing a
> default value to the get method?
>
> If we're using a cache isn't generating/getting the value expensive?
> It seems to encourage something boneheaded like:
>
> $default = someExpensiveOperation();
> $myValue = $myCache->get('foo', $default);
>
> I could understand passing a callable that would set the value for a cache
> miss...
>
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