Description
There is a version of Numbers.php which supports PHP 5.2, but it is no longer developed: https://github.com/powder96/numbers.php/archive/fd946ea8742ba46789dc2a38cc6c1f93a7512e6d.zip
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README
Numbers.php
Numbers.php  an advanced mathematics toolkit for PHP >= 5.3. It is a port of Numbers.js  same toolkit for JavaScript.
There is a version of Numbers.php which supports PHP 5.2, but it is no longer developed: https://github.com/powder96/numbers.php/archive/fd946ea8742ba46789dc2a38cc6c1f93a7512e6d.zip
Description
Numbers.php provides a comprehensive set of mathematical tools that currently are not offered in PHP. These tools include:
 Basic calculations
 Calculus
 Matrix Operations
 Prime Numbers
 Statistics
 More...
A few things to note before using: PHP, like many languages, does not necessarily manage floating points as well as we'd all like it to. For example, if adding decimals, the addition tool won't return the exact value. This is an unfortunate error. Precautions have been made to account for this. After including numbers, you can set an error bound. Anything in this will be considered an "acceptable outcome."
The primary uses cases are calculations and data analysis on the server side. For client side operations, please use Numbers.js.
How to use
Numbers is pretty straightforward to use.
For example, if we wanted to estimate the integral of sin(x) from 2 to 4, we could:
Use riemann integrals (with 200 subdivisions)
use NumbersPHP\Calculus;
use NumbersPHP\Matrix;
use NumbersPHP\Statistic;
use NumbersPHP\Prime;
Calculus::riemann('sin', 2, 4, 200);
Or use adaptive simpson quadrature (with epsilon 0.0001)
Calculus::adaptiveSimpson('sin', 2, 4, 0.0001);
Userdefined functions can be used too:
function myFunc($x) {
return 2 * pow($x, 2) + 1;
}
Calculus::riemann('myFunc', 2, 4, 200);
Calculus::adaptiveSimpson(create_function('$x', 'return 2 * pow($x, 2) + 1;'), 2, 4, 0.0001);
Now say we wanted to run some matrix calculations:
We can add two matrices
$matrix1 = array(array(0, 1, 2),
array(3, 4, 5));
$matrix2 = array(array( 6, 7, 8),
array( 9, 10, 11));
Matrix::addition($matrix1, $matrix2);
We can transpose a matrix
Matrix::transpose($array);
Numbers also includes some basic prime number analysis. We can check if a number is prime:
//basic check
Prime::simple($number);
// Miller�Rabin primality test
Prime::millerRabin($number);
The statistics tools include mean, median, mode, standard deviation, random sample generator, correlation, confidence intervals, ttest, chisquare, and more.
Statistic::mean($array);
Statistic::median($array);
Statistic::mode($array);
Statistic::standardDev($array);
Statistic::randomSample($lower, $upper, $n);
Statistic::correlation($array1, $array2);
Test
Download and install these things:
Run in the command prompt:
php composer.phar install
php phpunit.phar configuration phpunit.xml.dist
If you are going to run tests multiple times and you are using Microsoft(R) Windows(TM), you can use the batch file /test.cmd. Do not forget to set the path to PHP, Composer, and PHPUnit in the beginnig of that file.
Authors
Numbers.js
 Steve Kaliski  sjkaliski
 David Byrd  davidbyrd11
 Ethan Resnick  studip101
 Ethan  altercation
 Hrishikesh Paranjape  hrishikeshparanjape
 Greg Leppert  leppert
 LarsMagnus Skog  ralphtheninja
 Tim Wood  codearachnid
 Miles McCrocklin  milroc
 Nate Kohari  nkohari
 Eric LaForce  elaforc
 Kartik Talwar  KartikTalwar
 btmills
 swair shah  swairshah
 Jason Hutchinson  Zikes
 Philip I. Thomas  philipithomas
 Brandon Benvie  Benvie
 Larry Battle  LarryBattle
 kmcgrane