chance.php

<?php

function get_win($arr){
    $chance = rand(0, 100);
    $keys   = array_keys($arr);
    $total  = count($keys);

    if($total == 0) return false;

    $inter_stopper = 100;// DDOS FIX?
    $i = 0;// DDOS FIX?

    while (true) {
        $i++; // DDOS FIX?
        if($i == $inter_stopper) return $keys[0];  // DDOS FIX? LOGIC STOPPER
        $rand = rand(0, $total-1);
        if($arr[$keys[$rand]]['percent'] >= $chance)
            return $keys[$rand];
    }
}

function assign_chance(&$array){
    $max_sum = get_max_sum($array);

    foreach($array as $key => $value){
        $array[$key]['percent'] = 100 /  $max_sum * $array[$key]['min_sum'];
    }
}