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<?php $loopCount = 1e6; $min = 0; $max = mt_getrandmax()*2; $res = [ 'odd' => 0, 'even'=> 0, ]; while ($loopCount--) { $v = rand($min, $max); $v%2 ? $res['odd']++ : $res['even']++; } var_dump($res);

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18.37 ms | 406 KiB | 5 Q