Code Fuzzy

<?php

//koneksi
$DB_NAME = 'u4114683_devki';
$DB_HOST = 'localhost';
$DB_USER = 'u4114683_root';
$DB_PASS = 'devkimedia';
$connect = new mysqli($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

// //post data
$ip = $_SERVER['REMOTE_ADDR'];
$agen = $_SERVER['HTTP_USER_AGENT'];
// // print_r($_POST);
// // echo $nama;
$suhu = $_GET['suhu'];
$ph = $_GET['ph'];

$min_suhu = 20;
$max_suhu = 35;

$min_ph = 4;
$max_ph = 11;


/*
*   Fuzzy
*/

$min_panas = ($suhu - $min_suhu) / ($max_suhu - $min_suhu);
$min_dingin =  1 - $min_panas;

$min_basa = ($ph - $min_ph) / ($max_ph - $min_ph);
$min_asam = 1 - $min_basa;

$score_stabil = 100;
$score_kurang = 0;

/*
* Rule 1 => Dingin + Asam = Kurang Stabil
*/

$aPred[1] = min($min_dingin, $min_asam);
$x[1] = $score_stabil - (($score_stabil - $score_kurang) * $aPred[1]);

/*
* Rule 2 => Panas + Asam = Stabil
*/

$aPred[2] = min($min_panas, $min_asam);
$x[2] = $score_kurang + (($score_stabil - $score_kurang) * $aPred[2]);

/*
* Rule 3 => Dingin + Basa = Kurang Stabil
*/

$aPred[3] = min($min_dingin, $min_basa);
$x[3] = $score_stabil - (($score_stabil - $score_kurang) * $aPred[3]);

/*
* Rule 4 => Panas + Basa = Kurang Stabil
*/

$aPred[4] = min($min_panas, $min_basa);
$x[4] = $score_stabil - (($score_stabil - $score_kurang) * $aPred[4]);

/*
* Hasil
*/

$hasil = 0;
$pembagi = 0;

foreach ($aPred as $key => $pred){
    $val = $pred * $x[$key];
    $hasil = $hasil + $val;

    $pembagi = $pembagi + $pred;
}

$hasil = $hasil / $pembagi;

$kesimpulan = "STABIL";

if($hasil <= 50){
    $kesimpulan = "KURANG STABIL";
}

$sql ="insert into data_reader values (null, '$suhu', '$ph', '$hasil', '$kesimpulan', '$ip', '$agen', null)";
$hasil = mysqli_query($connect,$sql);

if($hasil){
    print_r(json_encode(['api_message'=>'sukses']));
}else{
    print_r(json_encode(['api_message'=>'gagal']));
}

?>