session_cache_expire(10); //tempo de sessão igual 10 minutos
session_start();
session_name(md5('seg'.$_SERVER['REMOTE_ADDR'].$_SERVER['HTTP_USER_AGENT']));
session_start();
if(isset($_POST)){
if($_SESSION['token'] == $_POST[‘token’]){
//post valido
}
}else{
$_SESSION['token'] = md5(time());
//adicione o token em um input hidden
}
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