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PhabricatorKeyValueSerializingCacheProxy.php
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			<?php

			/**
			* Proxies another cache and serializes values.
			*
			* This allows more complex data to be stored in a cache which can only store
			* strings.
			*/
			final class PhabricatorKeyValueSerializingCacheProxy
			extends PhutilKeyValueCacheProxy {

			public function getKeys(array $keys) {
			$results = parent::getKeys($keys);

			$reads = array();
			foreach ($results as $key => $result) {
			$structure = @unserialize($result);

			// The unserialize() function returns false when unserializing a
			// literal `false`, and also when it fails. If we get a literal
			// `false`, test if the serialized form is the same as the
			// serialization of `false` and miss the cache otherwise.
			if ($structure === false) {
			static $serialized_false;
			if ($serialized_false === null) {
			$serialized_false = serialize(false);
			}
			if ($result !== $serialized_false) {
			continue;
			}
			}

			$reads[$key] = $structure;
			}

			return $reads;
			}

			public function setKeys(array $keys, $ttl = null) {
			$writes = array();
			foreach ($keys as $key => $value) {
			if (is_object($value)) {
			throw new Exception(
			pht(
			'Serializing cache can not write objects (for key "%s")!',
			$key));
			}
			$writes[$key] = serialize($value);
			}

			return parent::setKeys($writes, $ttl);
			}


			}