How important is it to ensure that the MySQL user has the necessary permissions, such as INSERT rights, when working with MySQLi statements in PHP?

It is crucial to ensure that the MySQL user has the necessary permissions, such as INSERT rights, when working with MySQLi statements in PHP. Without the appropriate permissions, the user will not be able to execute INSERT queries successfully, leading to errors or data not being inserted into the database.

// Connect to MySQL database
$mysqli = new mysqli("localhost", "username", "password", "database");

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

// Set necessary permissions for the user
$mysqli->query("GRANT INSERT ON database.* TO 'username'@'localhost'");

// Perform INSERT query
$mysqli->query("INSERT INTO table_name (column1, column2) VALUES ('value1', 'value2')");

// Close connection
$mysqli->close();