how to get count(*) the right way in php - php

Question

I tried to count() the data from database with php but it don't show me the total data but it show the datas.
this is how I count
$query = "SELECT
mitra.*,
user.username,
user.privilege,
user.name
FROM
mitra
INNER JOIN
user ON mitra.id_user = user.id "
$result = $connection->query($query);
if ($result->num_rows > 0) {
foreach ($result as $row) :
$id = "" . $row["id"] . "";
$total = "" . $row["total_puas"] . "";
$privilege = "" . $row["privilege"] . "";
if ($privilege == 2) :
$calculate = $total / count($id);
var_dump(count($id));
endif;
endforeach;
}
===================
= id = total =
= 1 = 45.84 =
= 2 = 75.45 =
= 3 = 34.54 =
===================
when I var_dumb it it shows int(1)int(1)int(1) not int(3) that what I wanted.
actually I want to count $calculate with the data in $total that should be there is float and the amount from $total that I want to divided with count id
is there any solution that how to count the amount from $total and can be devided with count $id that should be 3?. please help
what I really trying to do from that table example is like 45.84 + 75.45 + 34.54 / 3

Answer 1

Sounds like you want a COUNT() with GROUP BY in your query. Doing count($id) in PHP will always yield one, as its not an array of values.
$query = "SELECT COUNT(id) as cnt, id, total_puas
FROM table
GROUP BY id";
$result = $connection->query($query);
if ($result->num_rows > 0) {
while ($row = $result->fetch_assoc()) {
$calculate = $row["total_puas"] / $row['cnt'];
echo $row['id']." has a count of ".$row['cnt'].", a total of ".$row['total_puas']." and calculated to ".$calculate."<br />\n";
}
}
From your updated question, the output becomes a bit more clear. Based on the output data and the result you desire, you want to calculate the sum of all total_paus, divided by the number of rows. You can do this directly in one query, like this
$query = "SELECT SUM(total_puas) / COUNT(u.id) as total
FROM mitra AS m
INNER JOIN user AS u
ON mitra.id_user = user.id";
$result = $connection->query($query);
$row = $result->fetch_assoc();
$total = $row['total'];
echo $total;

Answer 2

You can try this code:
<?php
$i = 0;
$total =0.00;
if ($result->num_rows > 0) {
while ($row = $result->fetch_array()):
if ($row["privilege"] == 2) :
$total = $total + $row["total"];
$i++;
endif;
endwhile;
echo $total."<br>";
echo $i."<br>";
echo $calculate = $total / $i;
}
?>
output
=====================================
$total = 155.83;
$i = 3;
$calculate = $total/$i;
$ans = 51.943333333333;
=====================================

Answer 3

You can try this code:
$query = "SELECT * FROM table"
$result = $connection->query($query);
if ($result->num_rows > 0) {
$total = 0.0;
foreach ($result as $row) :
$id = "" . $row["id"] . "";
$total = $total + $row['total'];
endforeach;
$calculate = $total / $result->num_rows;
echo $total.<br>;
echo $calclulate;
}