What potential security risks should be considered when displaying error messages in a PHP login form?

Displaying detailed error messages in a PHP login form can potentially expose sensitive information to attackers, such as valid usernames or email addresses. To mitigate this risk, it is recommended to provide generic error messages that do not disclose specific details about the error. 

// Example of displaying a generic error message in a PHP login form
if ($login_failed) {
    echo "Invalid username or password. Please try again.";
}

Keywords

SQL injection cross-site scripting error handling user input validation secure coding practices

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