What are the common methods for passing variables between PHP files?

When passing variables between PHP files, common methods include using sessions, cookies, GET and POST methods, and including files directly. Sessions allow you to store variables that can be accessed across different pages for a particular user session. Cookies can also store variables, but they are stored on the client side. GET and POST methods are used to pass variables through URLs or forms. Including files directly allows you to access variables defined in another PHP file. 

// Using sessions to pass variables between PHP files
session_start();
$_SESSION['variable_name'] = $value;

// Using cookies to pass variables between PHP files
setcookie('variable_name', $value, time() + 3600, '/');

// Passing variables through GET method
<a href="next_page.php?variable_name=<?php echo $value; ?>">Next Page</a>

// Passing variables through POST method
<form action="next_page.php" method="post">
    <input type="hidden" name="variable_name" value="<?php echo $value; ?>">
    <input type="submit" value="Submit">
</form>

// Including files to access variables
include 'file_with_variable.php';
echo $variable_name;

Keywords

include require $_GET $_POST session variables

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