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<?php
class csrf {
	
	public function get_token_id() {
        if(isset($_SESSION['token_id'])) { 
                return $_SESSION['token_id'];
        } else {
                $token_id = $this->random(10);
                $_SESSION['token_id'] = $token_id;
                return $token_id;
        }
	}
	
	public function get_token() {
        if(isset($_SESSION['token_value'])) {
                return $_SESSION['token_value']; 
        } else {
                $token = hash('sha256', $this->random(500));
                $_SESSION['token_value'] = $token;
                return $token;
        }
 
	}
	
	public function check_valid($method) {
        if($method == 'post' || $method == 'get') {
                $post = $_POST;
                $get = $_GET;
                if(isset(${$method}[$this->get_token_id()]) && (${$method}[$this->get_token_id()] == $this->get_token())) {
                        return true;
                } else {
                        return false;   
                }
        } else {
                return false;   
        }
	}
	
	private function random($len) {
        if (function_exists('openssl_random_pseudo_bytes')) {
                $byteLen = intval(($len / 2) + 1);
                $return = substr(bin2hex(openssl_random_pseudo_bytes($byteLen)), 0, $len);
        } elseif (@is_readable('/dev/urandom')) {
                $f=fopen('/dev/urandom', 'r');
                $urandom=fread($f, $len);
                fclose($f);
                $return = '';
        }
 
        if (empty($return)) {
                for ($i=0;$i<$len;++$i) {
                        if (!isset($urandom)) {
                                if ($i%2==0) {
                                             mt_srand(time()%2147 * 1000000 + (double)microtime() * 1000000);
                                }
                                $rand=48+mt_rand()%64;
                        } else {
                                $rand=48+ord($urandom[$i])%64;
                        }
 
                        if ($rand>57)
                                $rand+=7;
                        if ($rand>90)
                                $rand+=6;
 
                        if ($rand==123) $rand=52;
                        if ($rand==124) $rand=53;
                        $return.=chr($rand);
                }
        }
 
        return $return;
	}
	
}
?>

<?php
session_start();
include 'csrf.class.php';
 
$csrf = new csrf();
 
// Generate Token Id and Valid
$token_id = $csrf->get_token_id();
$token_value = $csrf->get_token($token_id);

?>

<form action="submit.php" method="post">
<input type="hidden" name="<?= $token_id; ?>" value="<?= $token_value; ?>" />
<input type="submit" value="Login"/>
</form>

<?php
session_start();
include 'csrf.class.php';
 
$csrf = new csrf();
 
// Generate Token Id and Valid
$token_id = $csrf->get_token_id();
$token_value = $csrf->get_token($token_id);

if($csrf->check_valid('post')) {
	var_dump($_POST[$token_id]);
} else {
	echo 'Not Valid';
}