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# ->initialize()
 -  throws an sfInitializationException exception if you don't pass a  parameter
# ->set() ->get() ->has()
 -  returns true if data are stored in cache
 -  retrieves data form the cache
 -  returns true if the cache exists
 -  takes a lifetime as its third argument
 -  returns the default value if cache has expired
 -  returns true if the cache exists
 -  returns null if the cache does not exist
 -  takes a default value as its second argument
 -  returns false if the cache does not exist
 -  overrides previous data stored in the cache
 -  retrieves the latest data form the cache
 -  false data are stored in the cache
 -  returns true if the cache exists with false value
 -  retrieves the latest data form the cache
 -  does not return default value if false is stored
 -  accepts a  cache key
 -  accepts a  cache key
 -  accepts a  cache key
# ->clean()
 -  cleans old cache key if given the sfCache::OLD argument
 -  cleans old cache key if given the sfCache::OLD argument
 -  cleans all cache key if given the sfCache::ALL argument
 -  cleans all cache key if given the sfCache::ALL argument
 -  cleans all cache key if given no argument
 -  cleans all cache key if given no argument
# ->remove()
 -  takes a cache key as its first argument
 -  takes a cache key as its first argument
 -  takes a cache key as its first argument
# ->removePattern()
# *:bar:foo
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
# foo:bar:*
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
# foo:**:foo
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
# foo:bar:**
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
# **:bar
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
# **
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
 -  takes a pattern as its first argument
# ->getTimeout()
 -  returns the timeout time for a given cache key
 -  returns the timeout time for a given cache key
 -  returns the timeout time for a given cache key
 -  returns the timeout time for a given cache key
 -  returns the timeout time for a given cache key
 -  returns 0 if the cache key does not exist
# ->getLastModified()
 -  returns the last modified time for a given cache key
 -  returns the last modified time for a given cache key
 -  returns the last modified time for a given cache key
 -  returns the last modified time for a given cache key
 -  returns the last modified time for a given cache key
 -  returns 0 if the cache key does not exist
# ->getMany()
 -  gets many keys in one call
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