What potential pitfalls should beginners be aware of when passing variables with special characters in PHP?

When passing variables with special characters in PHP, beginners should be aware of potential security vulnerabilities such as SQL injection or cross-site scripting attacks. To prevent these pitfalls, it is important to properly sanitize and validate user input before using it in your code. One way to do this is by using functions like htmlspecialchars() to encode special characters and prevent them from being interpreted as code. 

// Example of sanitizing user input to prevent SQL injection
$userInput = $_POST['username'];
$cleanInput = htmlspecialchars($userInput);

// Example of using the sanitized input in a SQL query
$query = "SELECT * FROM users WHERE username = '$cleanInput'";
$result = mysqli_query($connection, $query);

Keywords

PHP variables special characters escaping security

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