Code Coverage for /src/src/Mash.php

1	<?php
2	declare( strict_types = 1 );
3
4	namespace Wikimedia\Alea;
5
6	/**
7	* This is a helper class which just takes a bunch of mixed seed content
8	* and smushes it together to create a single numeric seed.
9	*/
10	class Mash {
11
12	/** @var int */
13	private $n;
14
15	public function __construct() {
16	$this->n = 0xefc8249d;
17	}
18
19	/**
20	* Mash in some more data.
21	* @param mixed $data Anything that can be an argument to `strval`.
22	* @return float The current mash
23	*/
24	public function mash( $data ): float {
25	$data = strval( $data );
26	$data = mb_convert_encoding( $data, 'ucs-2' );
27	$n = $this->n;
28	for ( $i = 0; $i < strlen( $data ); $i += 2 ) {
29	$charCode = ord( $data[$i] ) * 256 + ord( $data[$i + 1] );
30	$n += $charCode;
31	$h = 0.02519603282416938 * $n;
32	$n = intval( $h );
33	$h -= $n;
34	$h *= $n;
35	$n = intval( $h );
36	$h -= $n;
37	$n += $h * 0x100000000; // 2^32
38	}
39	$this->n = $n;
40	return intval( $n ) * 2.3283064365386963e-10; // 2^-32
41	}
42
43	public static function version(): string {
44	return 'Mash 0.9';
45	}
46	}