MyMMS

<?php
class MyMMS{
        private $lambda, $mu, $row, $Q, $L, $W, $U, $s;

        public function __construct($lambda, $mu, $s){
                $this->lambda = $lambda;
                $this->mu = $mu;
                $this->s = $s;
        }

        public function factorial($n){
                $fact = 1;
                if($n == 0)
                        return $fact;
                else{
                        for($i = $n; $i>0; $i--)
                                $fact *= $i;
                        return $fact;
                }
        }

        public function functionP0($a, $row){
                $temp = 0;

                for($k = 0; $k <= $this->s - 1; $k++){
                        $temp += (pow($a, (double)$k) / $this->factorial($k));
                }
                $temp +=( pow($a,(double) $this->s)/ ($this->factorial($this->s)*(1.0 - $row)));
                $p0 = pow($temp,-1);

                return $p0;
        }

        public function functionMMs(){
                //$p0, $a;

                $a = $this->lambda / $this->mu;
                $this->row = $a/(double) $this->s;
                $p0 = $this->functionP0($a, $this->row);
                $this->Q = (pow((double) $this->s,(double) $this->s) * pow($this->row,(double) $this->s + 1.0)) / ($this->factorial($this->s) * pow(1.0 - $this->row,2.0)) * $p0;//待ち人数
                $this->L = $this->Q + $a;//系内人数
                $this->W = $this->Q / $this->lambda;//待ち時間
                $this->U = $this->W + (1/$this->mu);//系内時間
                $this->UU = $this->L / $this->lambda;//系内時間
        }

        public function getrow() {
                return $this->row;
        }

        public function getQ() {
                return $this->Q;
        }

        public function getL() {
                return $this->L;
        }

        public function getW() {
                return $this->W;
        }

        public function getU() {
                return $this->U;
        }

        public function getResult(){
                $this->functionMMs();
                $result = array(
                        'lambda' => $this->lambda,
                        'mu' => $this->mu,
                        's' => $this->s,
                        'row' => $this->row,
                        'Q' => $this->Q,
                        'L' => $this->L,
                        'W' => $this->W,
                        'U' => $this->U,
                        'UU' => $this->UU
                );
                return $result;
        }
}
?>