How declare the data in column mysql - php

Question

Can someone help me, I wanna declare the data from column "status".
If 'green' then the value is 1.
If 'yellow' the value is 2.
If 'red' the value is 3.
And then all of that value can make line graph using PHP language.
name: 'Data Status',
data: [
<?php
$sql = "SELECT * FROM monitoring";
$result = mysqli_query($koneksi, $sql);
while ($data = mysqli_fetch_array($result))
{
?>
<?php echo $data["status"]?>, <?php
}?>
]
But I know the data cannot load properly because the type data is string.
+---------+------------+----------+----------+
| id_data | time | status | date |
+---------+------------+----------+----------+
| 1 | 05.00 | green | 01-01-18 |
| 2 | 05.30 | green | 02-01-18 |
| 3 | 05.30 | red | 03-01-18 |
| 4 | 05.30 | green | 04-01-18 |
| 5 | 05.15 | yellow | 05-01-18 |
| 6 | 05.20 | yellow | 06-01-18 |
| 7 | 05.11 | red | 07-01-18 |
| 8 | 05.05 | red | 08-01-18 |
| 9 | 05.22 | green | 09-01-18 |
+---------+------------+----------+----------+

Answer 1

<?php
$sql = "SELECT * FROM monitoring";
$result = mysqli_query($koneksi, $sql);
while ($data = mysqli_fetch_array($result)) {
switch ($data["status"]){
case 'green':
$value = 1;
break
case 'yellow':
$value = 2;
break;
case 'red':
$value = 3;
break;
default:
$value = 0;
break;
}
echo $data["status"] . ' ' . $value;
}

Answer 2

Possible the easiest would be a case statement in the sql
SELECT
`id_data`,
`time`,
`date`,
case
when `status`='green' then 1
when `status`='yellow' then 2
when `status`='red' then 3
end as `status`
FROM `monitoring`