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Example code of hichxm/hyperloglog

Informations about the package hyperloglog

HyperLogLog for PHP

Latest Stable Version Supported PHP Versions

Tests

A lightweight and dependency-free PHP implementation of the HyperLogLog probabilistic data structure for approximate cardinality estimation.

HyperLogLog allows you to estimate the number of distinct elements in very large datasets while using only a small, fixed amount of memory.

View on Packagist: hichxm/hyperloglog

Features

When to Use HyperLogLog

HyperLogLog is well suited for:

It is not appropriate when an exact distinct count is required.

Requirements

Note: The xxh3 and xxh128 hash algorithms are available only when supported by your PHP version and build. If unavailable, you can use any other algorithm returned by hash_algos(), such as sha256, sha512, or md5.

Installation

Install via Composer:

Basic Usage

The returned value is an approximation of the number of unique elements.

Constructor

Parameters

Parameter Description
counterBits Number of bits used to select registers. The number of registers is 2^counterBits.
hashAlgorithm Any hashing algorithm supported by PHP's hash() function.

Increasing counterBits improves accuracy while increasing memory usage.

Example:

Accuracy

The theoretical standard error is:

where:

Example:

Supported Hash Algorithms

Any algorithm supported by PHP can be used.

Examples include:

You can list available algorithms using:

Public API

Add an element

Estimate the number of distinct values

Calculate the theoretical error

Measure estimation error

References

License

MIT

All versions of hyperloglog with dependencies

PHP Build Version
Package Version
Requires php Version ^7.0|^7.1|^7.2|^7.3|^7.4|^8.0|^8.1|^8.2|^8.3|^8.4|^8.5
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