What are the potential pitfalls of storing both login names and display names in separate fields in a database?

Storing both login names and display names in separate fields in a database can lead to inconsistencies if one field is updated without updating the other. To solve this issue, you can store only the login name in the database and generate the display name dynamically when needed, ensuring that both are always in sync. 

// Retrieve the login name from the database
$login_name = $row['login_name'];

// Generate the display name based on the login name
$display_name = ucfirst($login_name); // Example: capitalize the first letter

// Use $display_name wherever the display name is needed
echo "Welcome, $display_name!";

Keywords

PHP database data normalization SQL injection user authentication

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