Are there any best practices for passing variables through links in PHP to ensure proper functionality across different servers?

When passing variables through links in PHP, it is important to ensure proper functionality across different servers by using urlencode() to encode the variables before appending them to the URL. This helps to avoid any special characters or spaces that may cause issues when the URL is decoded on the receiving end.

// Encode the variable before passing it through the link
$variable = urlencode($variable);

// Append the encoded variable to the URL
echo '<a href="example.php?var='.$variable.'">Link</a>';