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Biased.php

65 lines

1	<?php
2
3	namespace Faker\Provider;
4
5	class Biased extends Base
6	{
7	/**
8	* Returns a biased integer between $min and $max (both inclusive).
9	* The distribution depends on $function.
10	*
11	* The algorithm creates two doubles, x ∈ [0, 1], y ∈ [0, 1) and checks whether the
12	* return value of $function for x is greater than or equal to y. If this is
13	* the case the number is accepted and x is mapped to the appropriate integer
14	* between $min and $max. Otherwise two new doubles are created until the pair
15	* is accepted.
16	*
17	* @param integer $min Minimum value of the generated integers.
18	* @param integer $max Maximum value of the generated integers.
19	* @param callable $function A function mapping x ∈ [0, 1] onto a double ∈ [0, 1]
20	* @return integer An integer between $min and $max.
21	*/
22	public function biasedNumberBetween($min = 0, $max = 100, $function = 'sqrt')
23	{
24	do {
25	$x = mt_rand() / mt_getrandmax();
26	$y = mt_rand() / (mt_getrandmax() + 1);
27	} while (call_user_func($function, $x) < $y);
28
29	return (int) floor($x * ($max - $min + 1) + $min);
30	}
31
32	/**
33	* 'unbiased' creates an unbiased distribution by giving
34	* each value the same value of one.
35	*
36	* @return integer
37	*/
38	protected static function unbiased()
39	{
40	return 1;
41	}
42
43	/**
44	* 'linearLow' favors lower numbers. The probability decreases
45	* in a linear fashion.
46	*
47	* @return integer
48	*/
49	protected static function linearLow($x)
50	{
51	return 1 - $x;
52	}
53
54	/**
55	* 'linearHigh' favors higher numbers. The probability increases
56	* in a linear fashion.
57	*
58	* @return integer
59	*/
60	protected static function linearHigh($x)
61	{
62	return $x;
63	}
64	}
65