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SELECT column_name(s)
FROM table_name
ORDER BY column_name(s) ASC|DESC

<?php
$con=mysqli_connect("localhost","username","password","database");
// Check connection
if (mysqli_connect_errno())
{
    echo "Failed to connect: " . mysqli_connect_error();
}

$result = mysqli_query($con,"SELECT * FROM Persons ORDER BY age");

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

mysqli_close($con);
?>

Glenn Quagmire 33
Peter Griffin 35

SELECT column_name(s)
FROM table_name
ORDER BY column1, column2