How can the issue of variable passing be resolved in PHP, specifically in the context of register_globals and $_GET?

The issue of variable passing in PHP can be resolved by avoiding the use of register_globals, which can lead to security vulnerabilities. Instead, variables should be accessed through the superglobal arrays like $_GET, $_POST, and $_REQUEST to ensure proper handling of user input.

// Example of accessing variables using $_GET
$var = isset($_GET['variable']) ? $_GET['variable'] : '';