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Address.php
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Barcode.php
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Base.php
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Biased.php
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Color.php
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Company.php
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DateTime.php
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File.php
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HtmlLorem.php
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Image.php
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Internet.php
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Medical.php
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Miscellaneous.php
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Biased.php
72 lines
| 1 | <?php |
| 2 | /** |
| 3 | * @license MIT |
| 4 | * |
| 5 | * Modified by impress-org on 07-August-2024 using Strauss. |
| 6 | * @see https://github.com/BrianHenryIE/strauss |
| 7 | */ |
| 8 | |
| 9 | namespace Give\Vendors\Faker\Provider; |
| 10 | |
| 11 | class Biased extends Base |
| 12 | { |
| 13 | /** |
| 14 | * Returns a biased integer between $min and $max (both inclusive). |
| 15 | * The distribution depends on $function. |
| 16 | * |
| 17 | * The algorithm creates two doubles, x ∈ [0, 1], y ∈ [0, 1) and checks whether the |
| 18 | * return value of $function for x is greater than or equal to y. If this is |
| 19 | * the case the number is accepted and x is mapped to the appropriate integer |
| 20 | * between $min and $max. Otherwise two new doubles are created until the pair |
| 21 | * is accepted. |
| 22 | * |
| 23 | * @param int $min Minimum value of the generated integers. |
| 24 | * @param int $max Maximum value of the generated integers. |
| 25 | * @param callable $function A function mapping x ∈ [0, 1] onto a double ∈ [0, 1] |
| 26 | * |
| 27 | * @return int An integer between $min and $max. |
| 28 | */ |
| 29 | public function biasedNumberBetween($min = 0, $max = 100, $function = 'sqrt') |
| 30 | { |
| 31 | do { |
| 32 | $x = mt_rand() / mt_getrandmax(); |
| 33 | $y = mt_rand() / (mt_getrandmax() + 1); |
| 34 | } while (call_user_func($function, $x) < $y); |
| 35 | |
| 36 | return (int) floor($x * ($max - $min + 1) + $min); |
| 37 | } |
| 38 | |
| 39 | /** |
| 40 | * 'unbiased' creates an unbiased distribution by giving |
| 41 | * each value the same value of one. |
| 42 | * |
| 43 | * @return int |
| 44 | */ |
| 45 | protected static function unbiased() |
| 46 | { |
| 47 | return 1; |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * 'linearLow' favors lower numbers. The probability decreases |
| 52 | * in a linear fashion. |
| 53 | * |
| 54 | * @return int |
| 55 | */ |
| 56 | protected static function linearLow($x) |
| 57 | { |
| 58 | return 1 - $x; |
| 59 | } |
| 60 | |
| 61 | /** |
| 62 | * 'linearHigh' favors higher numbers. The probability increases |
| 63 | * in a linear fashion. |
| 64 | * |
| 65 | * @return int |
| 66 | */ |
| 67 | protected static function linearHigh($x) |
| 68 | { |
| 69 | return $x; |
| 70 | } |
| 71 | } |
| 72 |