Perhitungan Penjumlahan Menggunakan PHP

Assalamualaikum sobat. Haaaaaahh rasanya lama  banget udah g buka blogger. Kali ini saya akan berbagi sedikit ilmu  tentang PHP. Ya mungkin  php yang paling dasar. Paling nggak bisa buat di ajarkan bagi adek-adeknya. Hehehe
Ini adalah operasi penjumlahan menggunakan PHP
Berikut kodenya
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Belajar PHP Awal</title>
<style>
.kotak {
    background:linear-gradient(to bottom, #eee, #fafafa);
    padding:10px;
    width:300px;
    height:auto;
    border:2px solid #ddd;
    box-shadow:0 2px 9px  #ddd;
    margin:auto;
    margin-top:100px;
    }
input[type=email],
  input[type=number],
  input[type=password],
  input[type=tel],
  input[type=text],
  input[type=url] {
  -moz-appearance: none;
  -webkit-appearance: none;
  appearance: none;
  display: inline-block;
  width:234px;
  height: 36px;
  padding: 0 8px;
  margin: 0;
  background: #fff;
  border: 1px solid #d9d9d9;
  border-top: 1px solid #c0c0c0;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  -moz-border-radius: 1px;
  -webkit-border-radius: 1px;
  border-radius: 1px;
  font-size: 15px;
  color: #404040;
  }
  input[type=email]:hover,
  input[type=number]:hover,
  input[type=password]:hover,
  input[type=tel]:hover,
  input[type=text]:hover,
  input[type=url]:hover {
  border: 1px solid #b9b9b9;
  border-top: 1px solid #a0a0a0;
  -moz-box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
  -webkit-box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.1);
  }
  input[type=email]:focus,
  input[type=number]:focus,
  input[type=password]:focus,
  input[type=tel]:focus,
  input[type=text]:focus,
  input[type=url]:focus {
  outline: none;
  border: 1px solid #4d90fe;
  -moz-box-shadow: inset 0 1px 2px rgba(0,0,0,0.3);
  -webkit-box-shadow: inset 0 1px 2px rgba(0,0,0,0.3);
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.3);
  }
input[type=submit] {
    background: linear-gradient(to bottom, #0088CC, #0044CC);
    border: 1px solid #0088CC;
    color: #FFF;
    margin: 4px 10px;
    padding: 5px;
    width: 100px;
    border-radius:4px;
}
input[type=submit]:hover {
    cursor: pointer;
}
input[type=submit]:active {
    background: #0044CC;
}
</style>
</head>
<body>
<div class="kotak">
<form action="" method="post">
<input type="text" name="a" value="" />
<br />
<input type="text" name="b" value="" />
<br />
<input  type="submit" name="hitung" value="Hitung" />
<br />
<?php
if (isset($_POST['hitung'])){
    $a = $_POST['a'];
    $b = $_POST['b'];
$hasil =0;
    $hasil = $a + $b;
echo "Hasil = $hasil";
}
?>
</form>
</div>
</body>
</html>

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