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);
	}


	}