How can variables be effectively passed between windows in PHP without constant reassignment?

When passing variables between windows in PHP without constant reassignment, one effective method is to use sessions. By storing the variables in session variables, they can be accessed across different windows without the need for constant reassignment. 

// Start the session
session_start();

// Set the variable in one window
$_SESSION['variable_name'] = $value;

// Retrieve the variable in another window
$passed_variable = $_SESSION['variable_name'];

// Unset the session variable if needed
unset($_SESSION['variable_name']);

Keywords

PHP session variables cookies AJAX form submission

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