Changing value on button press using mysql if statement

What i am trying to do is change a value on a button press

Ie, Press the button and the value changes from 0 to a 1 one or Press the button and the value goes to a 1 from a 0.

and on and on. I am struggling on this part.

<?php
include ('db.php');
$conn = mysqli_connect("BLAH CONNECTION");

$result = mysqli_query($link, "SELECT * FROM on_offsurvey");

while($row = mysqli_fetch_array($result)){
    $status = $row["site_status"];

    echo $status;

}
    if ($status == 1) {
    $sql = "update on_offsurvey set site_status=0 where id=0)";
    } else if ($status == 0)  {
    $sql = "update on_offsurvey set site_status=1 where id=0)";
    }

if ($conn->query($sql) === TRUE) {
echo "New record created successfully";
}
?>

That part i am struggling on is the If/If else statement that controls my 0 to 1 or 1 to 0

Any help ?