无法调用静态变量

Question

I am brand new to PHP and have a simple project, I do Java. In my simple project I have some html files and some Php files. I connect to a device via SSH in my Php web page, and after that I am gonna run some commands and return back SSH returned data. Any ways, So I designed a Html file for Login and use that in my php , here is my Php code :

          <?php                
    class Connection {
    public static $ip; // I even made static this variable to test if I can access Static variable from other 
    public $username;
    public $password;
    public static $ssh;


    public  function sshConnection() {
        include ('./view/login.html'); // The html page contain variables 
        include('Net/SSH2.php'); // I use phpseclib to connect via SSH

        if(isset($_POST['lgin'], $_POST['ip'], $_POST['username'], $_POST['password'])) { // Login button in html file
            $this->ip = $_POST['ip']; // input type to get ip in html file
            $this->username = $_POST['username']; // input type to get username in html file
            $this->password = $_POST['password']; // input type to get password in html file
            $this->ssh = new Net_SSH2($this->ip);
            if (!$this->ssh->login($this->username, $this->password)) {
                print('Login faild');
            } else {

                header("Location: http://localhost/wireless/configwireless.php"); // This redirect to next page that I should display some Commands
            }
        }
    }
}
    $connection=new Connection();
    $connection->sshConnection();       
        ?>

I need $ssh variable in next page so that I can run commands via this connection and make sessions. I googled and find out I can access the static variable via this code :

classname::$variableName;

I even made my $ip variable static to test if I can access that or not, But no chance, Here is my configwireless.php Code :

<?php
   echo Connection::$ip; // Does not display the input ip variable.

?>

But it does not display the $ip variable. Where I am doing wrong?

Answer 1

For assignment static property in class, should be used self or static keyword. So instead of

$this->ip = $_POST['ip'];

use this

static::$ip = $_POST['ip'];

or

self::$ip = $_POST['ip'];

Answer 2

As my dear friend @Mohammad notice, after header("Location: http://localhost/wireless/configwireless.php"); variables will be lost. I did this before header("Location: http://localhost/wireless/configwireless.php"); :

            session_start();
            $_SESSION['ip'] = $this->ip; 

And in next page I added :

    session_start();
    $x=$_SESSION['ip'];
    echo $x;