How can the user improve their SQL query to avoid errors in the login process?

The user can improve their SQL query in the login process by using prepared statements with parameterized queries. This helps prevent SQL injection attacks and ensures that user input is properly sanitized before being executed in the database. By using prepared statements, the user can securely pass user input as parameters to the query, reducing the risk of errors and vulnerabilities in the login process. 

// Improved SQL query using prepared statements
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username AND password = :password");
$stmt->bindParam(':username', $username);
$stmt->bindParam(':password', $password);
$stmt->execute();

// Check if the query returned a row for successful login
if($stmt->rowCount() > 0){
    // Login successful
    // Redirect to dashboard or home page
} else {
    // Login failed
    // Display error message to the user
}

Keywords

SQL query login process error handling PHP functions database security

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