<?php

namespace Faker\Provider;

class Biased extends Base
{
    /**
     * Returns a biased integer between $min and $max (both inclusive).
     * The distribution depends on $function.
     *
     * The algorithm creates two doubles, x ∈ [0, 1], y ∈ [0, 1) and checks whether the
     * return value of $function for x is greater than or equal to y. If this is
     * the case the number is accepted and x is mapped to the appropriate integer
     * between $min and $max. Otherwise two new doubles are created until the pair
     * is accepted.
     *
     * @param int      $min      Minimum value of the generated integers.
     * @param int      $max      Maximum value of the generated integers.
     * @param callable $function A function mapping x ∈ [0, 1] onto a double ∈ [0, 1]
     *
     * @return int An integer between $min and $max.
     */
    public function biasedNumberBetween($min = 0, $max = 100, $function = 'sqrt')
    {
        do {
            $x = mt_rand() / mt_getrandmax();
            $y = mt_rand() / (mt_getrandmax() + 1);
        } while (call_user_func($function, $x) < $y);

        return (int) floor($x * ($max - $min + 1) + $min);
    }

    /**
     * 'unbiased' creates an unbiased distribution by giving
     * each value the same value of one.
     *
     * @return int
     */
    protected static function unbiased()
    {
        return 1;
    }

    /**
     * 'linearLow' favors lower numbers. The probability decreases
     * in a linear fashion.
     *
     * @return int
     */
    protected static function linearLow($x)
    {
        return 1 - $x;
    }

    /**
     * 'linearHigh' favors higher numbers. The probability increases
     * in a linear fashion.
     *
     * @return int
     */
    protected static function linearHigh($x)
    {
        return $x;
    }
}

• [D] ar_EG
• [D] ar_JO
• [D] ar_SA
• [D] at_AT
• [D] bg_BG
• [D] bn_BD
• [D] cs_CZ
• [D] da_DK
• [D] de_AT
• [D] de_CH
• [D] de_DE
• [D] el_CY
• [D] el_GR
• [D] en_AU
• [D] en_CA
• [D] en_GB
• [D] en_HK
• [D] en_IN
• [D] en_NG
• [D] en_NZ
• [D] en_PH
• [D] en_SG
• [D] en_UG
• [D] en_US
• [D] en_ZA
• [D] es_AR
• [D] es_ES
• [D] es_PE
• [D] es_VE
• [D] et_EE
• [D] fa_IR
• [D] fi_FI
• [D] fr_BE
• [D] fr_CA
• [D] fr_CH
• [D] fr_FR
• [D] he_IL
• [D] hr_HR
• [D] hu_HU
• [D] hy_AM
• [D] id_ID
• [D] is_IS
• [D] it_CH
• [D] it_IT
• [D] ja_JP
• [D] ka_GE
• [D] kk_KZ
• [D] ko_KR
• [D] lt_LT
• [D] lv_LV
• [D] me_ME
• [D] mn_MN
• [D] ms_MY
• [D] nb_NO
• [D] ne_NP
• [D] nl_BE
• [D] nl_NL
• [D] pl_PL
• [D] pt_BR
• [D] pt_PT
• [D] ro_MD
• [D] ro_RO
• [D] ru_RU
• [D] sk_SK
• [D] sl_SI
• [D] sr_Cyrl_RS
• [D] sr_Latn_RS
• [D] sr_RS
• [D] sv_SE
• [D] th_TH
• [D] tr_TR
• [D] uk_UA
• [D] vi_VN
• [D] zh_CN
• [D] zh_TW
• [F] Address.php
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• [F] Barcode.php
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• [F] Base.php
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• [F] Biased.php
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• [F] Color.php
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• [F] Company.php
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• [F] DateTime.php
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• [F] File.php
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• [F] HtmlLorem.php
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• [F] Image.php
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• [F] Internet.php
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• [F] Lorem.php
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• [F] Medical.php
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• [F] Miscellaneous.php
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• [F] Payment.php
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• [F] Person.php
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• [F] PhoneNumber.php
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• [F] Text.php
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• [F] UserAgent.php
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• [F] Uuid.php
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