zircote / bloom
A PHP/Redis Bloom filter experiment
Requires
- rediska/rediska: master-dev
This package is not auto-updated.
Last update: 2024-10-26 14:40:56 UTC
README
This project has morphed from an attempt of 'pure' php bloom filters to a tool
that employs Redis
and Rediska
as a storage and interface for a distributed
Bloom Filter
.
By utilizing the power of redis' SETBIT
and GETBIT
we are able to create a
simple, powerful and lightweight bloomfilter. The ability of redis to create a
BITSET that is practically endless in size 512MB the index limitations afforded
us is huge. PHP_INT_MAX serves well as a line in the sand in this early stage of
testing and research. This potentially results in a 3% false positive rate for
10b values given sufficient number of hashing buckets. (I am performing more on
these numbers before I get overly confident on these findings.)
Read Times on Benchmarks: 0.0011499519820647/s with three key hashing using a word list of 27607 unique strings.
Add Times on benchmark tests: 0.0036964981654479/s with three key hashing using a word list of 27607 unique strings.
<?php use Bloom\Filter, Bloom\Hash\HashMix, Bloom\Hash\Murmur, Rediska; /* Create the Filter */ $filter = new Filter(); /* Inject Rediska */ $filter->setRediska(new Rediska()); /* Inject the Hash Class */ if(extension_loaded('murmurhash')){ $filter->setHash(new Murmur()); } else { $filter->setHash(new HashMix()); } /* Add items to the filter */ $filter->add('some random text'); $filter->add(array('or add','an array of elements')); /* Check the filter */ var_dump($filter->contains('some random text')); // bool(true) var_dump($filter->contains('or add')); // bool(true) var_dump($filter->contains('This is not in the filter')); // bool(false) var_dump($filter->contains(array('or add','an array of elements'))); // bool(true) var_dump($filter->contains(array('NO','or add','an array of elements'))); // bool(false)