How can the PHP code be modified to avoid the warning message related to mysql_fetch_array?

The warning message related to mysql_fetch_array can be avoided by switching to the mysqli extension in PHP, which is more secure and efficient. To do this, you need to replace "mysql_" functions with "mysqli_" functions in your code. This includes changing functions like mysql_connect() to mysqli_connect() and mysql_fetch_array() to mysqli_fetch_array().

<?php
$mysqli = mysqli_connect("localhost", "username", "password", "database");

if (!$mysqli) {
    die("Connection failed: " . mysqli_connect_error());
}

$result = mysqli_query($mysqli, "SELECT * FROM table");

while ($row = mysqli_fetch_array($result)) {
    echo $row['column_name'] . "<br>";
}

mysqli_close($mysqli);
?>