StackOverflow2013

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copied!<p>I'm looking for a good cache key for APC that represents some complied information about an object, using the "object" as the key. I have a compilation method that does something like this:</p> <pre><code>function compile(Obj $obj) { if ($this->cache) { $cachekey = serialize($obj); if ($data = $this->cache->get($obj)) { return $data } } // compute result here if ($this->cache) { $this->cache->set($cachekey, $result); } return $result; } </code></pre> <p>If it's not obvious, <code>$this->cache</code> is an implementation of an interface with the methods <code>get</code> and <code>set</code>. </p> <p>Is there a quicker alternative to creating a key that's unique to <em>some</em> of the properties of this object? I can extract the relevant bits out, but then they are still arrays, which would have the same problem with serialization that I had with the objects in the first place. </p> <p>Serialize works, from a "correctness" position, but it seems wasteful (both in size of outputted key, and in computational complexity). </p> <p>EDIT: I would also like to add, if it's not obvious, that I will <em>not</em> be needing to unserialize this object. My verbatim code for the current cache key is actually: </p> <p><code>$cachekey = 'compile.' . sha1(serialize($obj));</code>. </p> <p>EDIT 2: The object I'm working with has the following definition:</p> <pre><code>class Route { protected $pattern; protected $defaults = array(); protected $requirements = array(); } </code></pre> <p><code>Pattern</code> and <code>requirements</code> are the values of the object that will change the output of this method, therefore a hash of these values must be present in the cache key. </p> <p>Also, someone suggested uniqid(), which would defeat the purpose of a general cache lookup key, as you could not reliably regenerate the same ID from the same information.</p> <p>EDIT 3: I guess I'm not giving enough context. Here's a link to the code so far: </p> <p><a href="https://github.com/efritz/minuet/blob/master/src/Minuet/Routing/Router.php#L160" rel="nofollow">https://github.com/efritz/minuet/blob/master/src/Minuet/Routing/Router.php#L160</a></p> <p>I guess I'm really only trying to avoid expensive calls to serialize (and I guess sha1, which is also a bit expensive). It's possible that the best I can do is try to reduce the size of what I'm serializing...</p>

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