What is the issue with extending MySQLi in PHP and how can it lead to errors like "Call to a member function set_charset() on a non-object"?

The issue with extending MySQLi in PHP is that the connection object may not be properly initialized, leading to errors like "Call to a member function set_charset() on a non-object". To solve this, ensure that the connection object is correctly instantiated before calling any methods on it. 

// Correct way to extend MySQLi and avoid errors like "Call to a member function set_charset() on a non-object"
$mysqli = new mysqli("localhost", "username", "password", "database");

if ($mysqli->connect_error) {
    die("Connection failed: " . $mysqli->connect_error);
}

$mysqli->set_charset("utf8");

Keywords

MySQLi PHP set_charset() extending errors

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