How can the function existUserName() be modified to return the expected result when checking for existing usernames in a database?

The issue with the existing existUserName() function is that it is not connecting to a database to check for existing usernames. To solve this issue, we need to modify the function to include a database connection and query to check if the username already exists in the database. We can achieve this by using PHP PDO or MySQLi to interact with the database. 

function existUserName($username) {
    $pdo = new PDO('mysql:host=localhost;dbname=your_database_name', 'username', 'password');
    
    $stmt = $pdo->prepare('SELECT COUNT(*) FROM users WHERE username = :username');
    $stmt->bindParam(':username', $username);
    $stmt->execute();
    
    $result = $stmt->fetchColumn();
    
    return $result > 0;
}

Keywords

PHP function existUserName() database modification

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