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<?php /** * @param array $items * @param array $weights * * @return mixed */ function random_weighted(array $items, array $weights) { $weight = 0; $return = current($items); for ($i = 0, $n = count($items); $i < $n; ++$i) { $random = mt_rand(0, $weights[$i] + $weight); if ($random >= $weight) { $return = $items[$i]; } $weight += $weights[$i]; } return $return; } $items = ['a', 'b', 'c']; $weights = [0, 3, 3]; $i = 100; $results = ['a' => 0, 'b' => 0, 'c' => 0]; do { $x = random_weighted($items, $weights); $results[$x]++; } while (--$i); var_dump($results);
Output for 7.1.6, 7.1.28, 7.2.5, 7.2.21, 7.3.9, 7.4.0
array(3) { ["a"]=> int(0) ["b"]=> int(40) ["c"]=> int(60) }
Output for 5.6.11, 7.2.0, 7.3.1, 7.3.4, 7.3.12
array(3) { ["a"]=> int(0) ["b"]=> int(36) ["c"]=> int(64) }
Output for 5.6.15, 7.0.1, 7.1.33, 7.2.4, 7.3.11
array(3) { ["a"]=> int(0) ["b"]=> int(38) ["c"]=> int(62) }
Output for 5.6.20, 7.0.2, 7.2.18, 7.2.24, 7.3.10
array(3) { ["a"]=> int(0) ["b"]=> int(44) ["c"]=> int(56) }
Output for 7.1.25, 7.2.2, 7.2.11, 7.3.8
array(3) { ["a"]=> int(0) ["b"]=> int(42) ["c"]=> int(58) }
Output for 5.5.30, 5.6.14, 5.6.28, 7.0.0, 7.0.4, 7.2.13, 7.3.5, 7.3.7
array(3) { ["a"]=> int(0) ["b"]=> int(45) ["c"]=> int(55) }
Output for 5.5.29, 5.5.31 - 5.5.32, 5.6.17, 7.0.6, 7.2.25, 7.3.6
array(3) { ["a"]=> int(0) ["b"]=> int(51) ["c"]=> int(49) }
Output for 5.5.26, 5.6.10, 7.0.3, 7.1.29, 7.3.3
array(3) { ["a"]=> int(0) ["b"]=> int(49) ["c"]=> int(51) }
Output for 7.1.27, 7.3.2
array(3) { ["a"]=> int(0) ["b"]=> int(47) ["c"]=> int(53) }
Output for 5.5.24, 5.5.27, 5.5.35, 5.6.13, 7.2.7, 7.2.10, 7.2.22 - 7.2.23, 7.3.0
array(3) { ["a"]=> int(0) ["b"]=> int(41) ["c"]=> int(59) }
Output for 7.2.20
array(3) { ["a"]=> int(0) ["b"]=> int(30) ["c"]=> int(70) }
Output for 5.6.8, 7.2.8, 7.2.12, 7.2.19
array(3) { ["a"]=> int(0) ["b"]=> int(48) ["c"]=> int(52) }
Output for 5.6.16, 5.6.21, 7.1.0, 7.2.17
array(3) { ["a"]=> int(0) ["b"]=> int(39) ["c"]=> int(61) }
Output for 5.6.9, 5.6.12, 5.6.19, 7.0.20, 7.2.9
array(3) { ["a"]=> int(0) ["b"]=> int(37) ["c"]=> int(63) }
Output for 7.1.5, 7.1.7, 7.1.31, 7.2.1, 7.2.6
array(3) { ["a"]=> int(0) ["b"]=> int(43) ["c"]=> int(57) }
Output for 7.2.3
array(3) { ["a"]=> int(0) ["b"]=> int(33) ["c"]=> int(67) }
Output for 7.1.32
array(3) { ["a"]=> int(0) ["b"]=> int(35) ["c"]=> int(65) }
Output for 5.5.25, 5.5.34, 5.6.18, 7.0.5, 7.1.30
array(3) { ["a"]=> int(0) ["b"]=> int(46) ["c"]=> int(54) }
Output for 7.1.26
array(3) { ["a"]=> int(0) ["b"]=> int(56) ["c"]=> int(44) }
Output for 5.5.33
array(3) { ["a"]=> int(0) ["b"]=> int(55) ["c"]=> int(45) }
Output for 5.5.28
array(3) { ["a"]=> int(0) ["b"]=> int(52) ["c"]=> int(48) }

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