Mash.php
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Mash.php
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	<?php
	declare( strict_types = 1 );

	namespace Wikimedia\Alea;

	/**
	* This is a helper class which just takes a bunch of mixed seed content
	* and smushes it together to create a single numeric seed.
	*/
	class Mash {

	/** @var int */
	private $n;

	public function __construct() {
	$this->n = 0xefc8249d;
	}

	/**
	* Mash in some more data.
	* @param mixed $data Anything that can be an argument to `strval`.
	* @return float The current mash
	*/
	public function mash( $data ): float {
	$data = strval( $data );
	$data = mb_convert_encoding( $data, 'ucs-2' );
	$n = $this->n;
	for ( $i = 0; $i < strlen( $data ); $i += 2 ) {
	$charCode = ord( $data[$i] ) * 256 + ord( $data[$i + 1] );
	$n += $charCode;
	$h = 0.02519603282416938 * $n;
	$n = intval( $h );
	$h -= $n;
	$h *= $n;
	$n = intval( $h );
	$h -= $n;
	$n += $h * 0x100000000; // 2^32
	}
	$this->n = $n;
	return intval( $n ) * 2.3283064365386963e-10; // 2^-32
	}

	public static function version(): string {
	return 'Mash 0.9';
	}
	}