php pass variable to one page to another

 There are many ways for pass variable value to another page.

1 : GET and POST

You can pass variable value with url. 

header("Location: ../signup.php?newpwd=passwordupdated");

login.php?id=123&username=user

You can add the variable in the link to the next page:
<a href="page2.php?varname=<?php echo $var_value ?>">Page2</a>
This will create a GET variable.
Another way is to include a hidden field in a form that submits to page two:
<form method="get" action="page2.php">
    <input type="hidden" name="varname" value="var_value">
    <input type="submit">
</form>
And then on page two:
//Using GET
$var_value = $_GET['varname'];

//Using POST
$var_value = $_POST['varname'];

//Using GET, POST or COOKIE.
$var_value = $_REQUEST['varname'];
Just change the method for the form to post if you want to do it via post. Both are equally insecure, although GET is easier to hack.
The fact that each new request is, except for session data, a totally new instance of the script caught me when I first started coding in PHP. Once you get used to it, it's quite simple though.

2 : Session:

//On page 1
$_SESSION['varname'] = $var_value;

//On page 2
$var_value = $_SESSION['varname'];
Remember to run the session_start(); statement on both these pages before you try to access the $_SESSION array, and also before any output is sent to the browser.

3 : Cookie:
//One page 1
$_COOKIE['varname'] = $var_value;

//On page 2
$var_value = $_COOKIE['varname'];
The big difference between sessions and cookies is that the value of the variable will be stored on the server if you're using sessions, and on the client if you're using cookies. I can't think of any good reason to use cookies instead of sessions, except if you want data to persist between sessions, but even then it's perhaps better to store it in a DB, and retrieve it based on a username or id.

4 : In MVC (Like Codeigniter):
In mvc, you can pass value in easy way.

<?php $this->load->view('jobs_notes_list', ['activity_history' => $activity_history , 'job_id' => $job_id]);?>