palicao / php-rebloom
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Requires
- php: >=7.2.0
- ext-redis: *
Requires (Dev)
- phpunit/phpunit: ^8.3
- vimeo/psalm: ^3.5
This package is auto-updated.
Last update: 2024-10-27 03:57:38 UTC
README
Use Redis Bloom with PHP!
Disclaimer: this is a very lightweight library. For a battery-included experience, please checkout: https://github.com/averias/phpredis-bloom
Install
composer require palicao/php-rebloom
Bloom Filter
A Bloom filter is a space-efficient probabilistic data structure designed to determine whether an element is present in a set. False positives are possible.
$bloomFilter = new BloomFilter(
new RedisClient(
new Redis(),
new RedisConnectionParams($host, $port)
)
);
reserve
BloomFilter::reserve(string $key, float $error, int $capacity): bool
Creates an empty Bloom Filter with a given desired error ratio and initial capacity.
See https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfreserve.
insert
BloomFilter::insert(string $key, string $value, ?float $error = null, ?int $capacity = null): bool
Adds an item to the Bloom Filter, creating the filter if it does not yet exist.
See https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfadd and https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfinsert.
insertMany
BloomFilter::insertMany(string $key, array $values, ?float $error = null, ?int $capacity = null): bool[]
Adds several items to the BloomFilter, creating the filter if it does not yet exist.
See https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfmadd and https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfinsert.
insertIfKeyExists
BloomFilter::insertIfKeyExists(string $key, string $value): bool
Adds an item to the Bloom Filter, only if the filter already exists.
See https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfadd and https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfinsert.
insertManyIfKeyExists
BloomFilter::insertManyIfKeyExists(string $key, array $values): bool[]
Adds several items to the Bloom Filter, only if the filter already exists.
See https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfadd and https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfinsert.
exists
BloomFilter::exists(string $key, string $value): bool
Checks if an item exists.
See https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfadd.
manyExist
BloomFilter::manyExist(string $key, array $values): bool[]
Checks if many items exist.
See https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfmexists.
scanDump, loadChunks and copy
BloomFilter::scanDump(string $key): array
BloomFilter::loadChunks(string $key, array $chunks): void
BloomFilter::copy(string $sourceKey, string $destKey): void
scanDump exports the whole Bloom Filter in an array, which can be loaded in chunks by
loadChunks. The copy function, using the previous 2 functions, allows to quickly
copy one Bloom Filter to a different key.
See https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfscandump and https://oss.redislabs.com/redisbloom/Bloom_Commands/#bfloadchunk.
Cuckoo Filter
Cuckoo filter is similar to Bloom Filter, but it's even more space-efficient and allows deleting items.
$cuckooFilter = new CuckooFilter(
new RedisClient(
new Redis(),
new RedisConnectionParams($host, $port)
)
);
reserve
CuckooFilter::reserve(string $key, int $capacity, ?int $bucketSize = null, ?int $maxIterations = null, ?int $expansion = null): bool
Create an empty cuckoo filter with an initial capacity. The false positive rate is fixed at about 3%, depending on how full the filter is.
See https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfreserve.
insert
CuckooFilter::insert(string $key, string $value, bool $allowDuplicateValues = true, ?int $capacity = null): bool
Adds an item to the cuckoo filter, creating the filter if it does not exist.
See https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfadd, https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfaddnx, https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfinsert, https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfinsertnx.
insertMany
CuckooFilter::insertMany(string $key, array $values, bool $allowDuplicateValues = true, ?int $capacity = null): bool[]
Similar to the previous, adds many values to the key.
See https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfadd, https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfaddnx, https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfinsert, https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfinsertnx.
insertIfKeyExists
CuckooFilter::insertIfKeyExists(string $key, string $value, bool $allowDuplicateValues = true, ?int $capacity = null): bool
Inserts an item in a cuckoo filter, only if it exists.
See https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfadd, https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfaddnx, https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfinsert, https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfinsertnx.
insertManyIfKeyExists
CuckooFilter::insertManyIfKeyExists(string $key, array $values, bool $allowDuplicateValues = true, ?int $capacity = null): bool[]
Inserts many items in a cuckoo filter, only if it exists.
See https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfadd, https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfaddnx, https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfinsert, https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfinsertnx.
exists
CuckooFilter::exists(string $key, string $value): bool
Returns true if a cuckoo filter exists.
See https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfexists.
delete
CuckooFilter::delete(string $key, string $value): bool
Deletes an item once in a filter.
See https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfdel.
count
CuckooFilter::count(string $key, string $value): int
Returns the number of times an item may be in the filter.
See https://oss.redislabs.com/redisbloom/Cuckoo_Commands/#cfcount.
scanDump, loadChunks and copy
CuckooFilter::scanDump(string $key): array
CuckooFilter::loadChunks(string $key, array $chunks): void
CuckooFilter::copy(string $sourceKey, string $destKey): void
scanDump exports the whole Cuckoo Filter in an array, which can be loaded in chunks by
loadChunks. The copy function, using the previous 2 functions, allows to quickly
copy one Cuckoo Filter to a different key.
CountMinSketch
Count-Min Sketch is a probabilistic data structure that serves as a frequency table of events in a stream of data.
$countMinSketch = new CountMinSketch(
new RedisClient(
new Redis(),
new RedisConnectionParams($host, $port)
)
);
initByDimensions
CountMinSketch::initByDimensions(string $key, int $width, int $depth): bool
Initializes a CountMinSketch named $key with the $width and $depth provided by the user.
See https://oss.redislabs.com/redisbloom/CountMinSketch_Commands/#cmsinitbydim.
initByProbability
CountMinSketch::initByProbability(string $key, float $error, float $probability): bool
Initializes a CountMinSketch to accommodate the desired error rate and probability for inflated count.
See https://oss.redislabs.com/redisbloom/CountMinSketch_Commands/#cmsinitbyprob.
incrementBy
CountMinSketch::incrementBy(string $key, Pair ...$pairs): bool
Increments one or more items by a given value in a CountMinSketch. A Pair represents an item and the value we want to increment.
See https://oss.redislabs.com/redisbloom/CountMinSketch_Commands/#cmsincrby.
query
CountMinSketch::query(string $key, string ... $items): Pair[]
Returns the approximate count for one or more items.
See https://oss.redislabs.com/redisbloom/CountMinSketch_Commands/#cmsquery.
merge
Merges multiple CountMinSketches into one, so that the value for each item is the sum
of the values in each sketch. The $sourceKeysWeightMap is an associative array
where each key is a sketch, and the value is the weight, that is the value we want
each item count to be multiplied by before merging.
CountMinSketch::merge(string $destinationKey, array $sourceKeysWeightMap) : bool
See https://oss.redislabs.com/redisbloom/CountMinSketch_Commands/#cmsmerge.
info
Returns an instance of CountMinSketchInfo, which contains information regarding width, depth and total count of the sketch.
CountMinSketch::info(string $key): CountMinSketchInfo
See https://oss.redislabs.com/redisbloom/CountMinSketch_Commands/#cmsinfo.
TopK
Similar to CountMinSketch, is based on the algorithm described here: https://www.usenix.org/conference/atc18/presentation/gong
reserve
TopK::reserve(string $key, int $topK, int $width, int $depth, float $decay): bool
Reserves a TopK suitable to calculate $topK top elements, with a given $width and $depth and with
a specified $decay (probability of reducing a counter in an occupied bucket).
See https://oss.redislabs.com/redisbloom/TopK_Commands/#topkreserve.
add
Adds one or more item to the TooK. If an item enters the Top-K list, the item which is expelled is returned in the position that was occupied by the added item that took its place in the Top-K.
TopK::add(string $key, string ... $items): array
See https://oss.redislabs.com/redisbloom/TopK_Commands/#topkadd.
incrementBy
Increase the score of an item in the data structure by increment. Similar to add, expelled items are returned.
TopK::incrementBy(string $key, Pair ...$pairs): array
See https://oss.redislabs.com/redisbloom/TopK_Commands/#topkincrby.
query
Returns subset of $items containing the elements found in the Top-K.
TopK::query(string $key, string ... $items): string[]
See https://oss.redislabs.com/redisbloom/TopK_Commands/#topkquery.
count
Returns a subset of $items containing the elements found in the top-k with their approximate count.
TopK::count(string $key, string ... $items): Pair[]
See https://oss.redislabs.com/redisbloom/TopK_Commands/#topkcount.
list
Returns the top-k items with their relative position.
TopK::list(string $key): Pair[]
See https://oss.redislabs.com/redisbloom/TopK_Commands/#topklist.
info
Returns a TopKInfo object containing information about size, with, depth and decay of the Top-K
TopK::info(string $key): TopKInfo
See https://oss.redislabs.com/redisbloom/TopK_Commands/#topkinfo.