1. get
보안에 취약해서 '조회'할 때 쓰임
http://localhost/php/form/number.html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<form action="number.php" method="get">
<input type="number" name="num1" max="20" min="1">
<input type="number" name="num2" max="20" min="1">
<button type="submit">전송</button>
<button type="reset">취소</button>
</form>
</body>
</html>
number.php

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<?php
$num1 = $_GET['num1'];
$num2 = $_GET['num2'];
?>
<p>
<?php
if($num1 == $num2) {
echo "num1의 값은 {$num1}이고 num2의 값은 {$num2}이며 같습니다.";
} elseif($num1 > $num2) {
echo "num1의 값은 {$num1}이고 num2의 값은 {$num2}이며 num1이 더 큽니다.";
} else {
echo "num1의 값은 {$num1}이고 num2의 값은 {$num2}이며 num2가 더 큽니다.";
}
?>
</p>
</body>
</html>
2. post
글을 수정하거나 회원가입 할 경우 ...,
http://localhost/php/form/number.html

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<form action="number.php" method="post">
<input type="number" name="num1" max="20" min="1">
<input type="number" name="num2" max="20" min="1">
<button type="submit">전송</button>
<button type="reset">취소</button>
</form>
</body>
</html>
number.php

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<?php
$num1 = $_POST['num1'];
$num2 = $_POST['num2'];
var_dump($_POST);
?>
<p>
<?php
if($num1 == $num2) {
echo "num1의 값은 {$num1}이고 num2의 값은 {$num2}이며 같습니다.";
} elseif($num1 > $num2) {
echo "num1의 값은 {$num1}이고 num2의 값은 {$num2}이며 num1이 더 큽니다.";
} else {
echo "num1의 값은 {$num1}이고 num2의 값은 {$num2}이며 num2가 더 큽니다.";
}
?>
</p>
</body>
</html>


HTML input태그의 name이 PHP 받아오는 변수 배열의 키 값으로 들어감 !
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