echo "<audio autoplay><source src="sounds/beep.wav" type="audio/wav"
        autoplay></audio>";

<?php
    $result = $db->query("SELECT * FROM my_table WHERE sound=1");
    while($row = $result->fetch_assoc()){
    echo $row['sound'];
    }
    $sound=$row['sound'];
    if ($sound = "1"){
            echo "<audio autoplay><source src="/sounds/beep.wav"
    type="audio/wav" autoplay></audio>";

    }
    ?>