How can PHP be used to prevent "register_globals" issues when displaying form data?

The "register_globals" issue can be prevented by using PHP superglobal arrays like $_POST or $_GET to access form data instead of relying on automatically globalizing variables. This ensures that form data is explicitly accessed and prevents potential security vulnerabilities. 

<?php
// Access form data using $_POST superglobal
$username = isset($_POST['username']) ? $_POST['username'] : '';
$email = isset($_POST['email']) ? $_POST['email'] : '';

// Display form data
echo "Username: " . htmlspecialchars($username) . "<br>";
echo "Email: " . htmlspecialchars($email);
?>

Keywords

PHP register_globals form data security input validation

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