POST/GETを使った際にリロードによる2重送信を防止する｜ Mana Design Lab.

session_start();
$u_id = htmlspecialchars($_GET['uid']);
$confirm = htmlspecialchars($_POST['confirm']);
switch($confirm){
	case $u_id:
		if (isset($_SESSION[$u_id], $_POST[$u_id]) && $_SESSION[$u_id] === $_POST[$u_id]){
			unset($_SESSION[$u_id]);
		}else{
			$http = is_ssl() ? 'https' : 'http' . '://';
			$url = $http . $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"];
			header("Location: ".$url);
		}
		break;
	default:
		$_POST = array();
		$_SESSION = array();
		break;
}

session_start();

$u_id = htmlspecialchars($_GET['uid']);

$confirm = htmlspecialchars($_POST['confirm']);

switch($confirm){

case $u_id:

if (isset($_SESSION[$u_id], $_POST[$u_id]) && $_SESSION[$u_id] === $_POST[$u_id]){

unset($_SESSION[$u_id]);

}else{

$http = is_ssl() ? 'https' : 'http' . '://';

$url = $http . $_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"];

header("Location: ".$url);

}

break;

default:

$_POST = array();

$_SESSION = array();

break;

}

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