Try to separate a loop result - php

Question

I'm making a poll, and I have a php script to get the percents of the number voted for that poll option. When i run a query I just keep getting 0 for the options. How can I make it so that each $val1 has a different number according to the row total in the database for?
For example: poll option 1 has 1 vote, poll option 2 has 1 vote, poll option 3 has 0 and poll option 4 has 0. and the query would output 50 option one and option 2 and 0 for option 3 and four.
My code
$poll = $db->fetch("SELECT * FROM home_poll ORDER BY id DESC LIMIT 1");
$option_sql = $db->query("SELECT total FROM home_polls_option WHERE poll_id = '" . $poll['id'] . "'");
while ($row = mysqli_fetch_array($option_sql)) {
$val1 = $row['total'];
}
$poll_votess = $db->query("SELECT * FROM home_polls_vote WHERE poll_id = '" . $poll['id'] ."'");
$val2 = $poll_votess->num_rows;
$res = round ($val1 / $val2 * 100);
$options1 .= ' <script>
var doughnutData = [
{
value: ' . $res . ',
color:"#F7464A"
},
{
value : ' . $res . ',
color : "#46BFBD"
},
{
value : ' . $res . ',
color : "#FDB45C"
},
{
value : '. $res.',
color : "#949FB1"
}
];
var myDoughnut = new Chart(document.getElementById("canvas").getContext("2d")).Doughnut(doughnutData);
</script>';
Database :
home_polls_vote: http://prntscr.com/2vd1lt
home_polls_option: http://prntscr.com/2vd1k7

Answer 1

In while loop you have took in $val1 just latest row value and because it is 0 votes, you got everywhere 0. You need to put it into array and later on use $res as array also so you can print different values down there in your script.
EDIT:
You can try something like this. First fetch total number of votes, then put percent in result in while loop.
$poll = $db->fetch("SELECT * FROM home_poll ORDER BY id DESC LIMIT 1");
$option_sql = $db->query("SELECT total FROM home_polls_option WHERE poll_id = '" . $poll['id'] . "'");
$poll_votess = $db->query("SELECT * FROM home_polls_vote WHERE poll_id = '" . $poll['id'] ."'");
$number_of_votes= $poll_votess->num_rows;
while ($row = mysqli_fetch_array($option_sql)) {
$res[] = round ($row['total'] / $number_of_votes * 100);
}
$options1 .= '<script>
var doughnutData = [
{
value: ' . $res[0] . ',
color:"#F7464A"
},
{
value : ' . $res[1] . ',
color : "#46BFBD"
},
{
value : ' . $res[2] . ',
color : "#FDB45C"
},
{
value : '. $res[3].',
color : "#949FB1"
}
];
var myDoughnut = new Chart(document.getElementById("canvas").getContext("2d")).Doughnut(doughnutData);
</script>';

Answer 2

Use mysql it'self for calculation this will avoid many lines of code and ease to process
http://dev.mysql.com/doc/refman/5.0/en/precision-math-rounding.html
https://dev.mysql.com/doc/refman/5.0/en/case.html
$sql = " SELECT ROUND(COUNT(hpv.id)/hpo.total * 100) AS res
FROM home_polls_option AS hpo
JOIN home_polls_vote AS hpv ON hpv.poll_id = hpo.poll_id
WHERE hpv.poll_id=$poll ['id']
GROUP BY hpo.value";