Are there any security considerations to keep in mind when passing variables between pages in PHP?

When passing variables between pages in PHP, it is important to sanitize and validate the data to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. One way to do this is by using PHP's built-in functions like htmlspecialchars() to encode the data before displaying it on the page.

// Sanitize and validate the variable before passing it to another page
$variable = htmlspecialchars($_POST['variable']);
header("Location: newpage.php?variable=" . $variable);
exit();