Description:
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For the most users calling apc_delete it is only impotent the the key or keys are no more available in the cache.

Than to check if the key is removed a simple
if (apc_delete($key) === true)
isn't enough because apc_delete return also false if the given $key doesn't exist in the cache. Therefor an additional apc_fetch($key, $success) is needed to test this :(

It isn't wrong at all but the additional check if some other problems occurred is pretty overhead.

If the a chance to change the return value if file is missing (e.g. null) or to add a second argument like the following: ?
apc_delete(string $key, [bool $falseOnMissing])


Thanking you in anticipation.