What are some common troubleshooting steps to address login issues in PHP applications?

Issue: One common troubleshooting step to address login issues in PHP applications is to check if the user credentials are correct. This involves verifying if the username and password entered by the user match the ones stored in the database. Code snippet: 

// Assuming $username and $password are the user input values
// Connect to the database
$connection = mysqli_connect("localhost", "username", "password", "database");

// Query the database for the user with the provided username
$query = "SELECT * FROM users WHERE username = '$username'";
$result = mysqli_query($connection, $query);

// Check if a user with the provided username exists
if(mysqli_num_rows($result) > 0) {
    $user = mysqli_fetch_assoc($result);
    
    // Verify if the password matches
    if(password_verify($password, $user['password'])) {
        // Login successful
        echo "Login successful!";
    } else {
        // Incorrect password
        echo "Incorrect password!";
    }
} else {
    // User does not exist
    echo "User does not exist!";
}

// Close the database connection
mysqli_close($connection);

Keywords

authentication session management error handling password hashing debugging

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