<?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', 'd']; $weights = [0, 1, 1, 1]; $i = 100; $results = ['a' => 0, 'b' => 0, 'c' => 0, 'd' => 0]; do { $x = random_weighted($items, $weights); $results[$x]++; } while (--$i); var_dump($results);
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