What are common issues with displaying Umlauts from a MySQL database using PHP?

Common issues with displaying Umlauts from a MySQL database using PHP include character encoding mismatches between the database and the PHP script. To solve this issue, ensure that both the database and PHP script are using the same character encoding, such as UTF-8.

// Set the character encoding for the database connection
$mysqli = new mysqli("localhost", "username", "password", "database");
$mysqli->set_charset("utf8");

// Set the character encoding for the PHP script
header('Content-Type: text/html; charset=utf-8');