Count all foreach PHP - php

Question

I've got a question:
I have the following code:
foreach($_COOKIE as $key => $value) {
$sql = "SELECT * FROM producten WHERE id='$key'";
$result = mysqli_query($conn, $sql);
while($row = $result->fetch_assoc()) {
$prijs = $row['prijs'];
echo $prijs;
}
}
What I want to do is to count all the $prijs variables (int).
I tried to use count($prijs) but didn't work.

Answer 1

To get the count of number of time loop, you can use counter variable and to get the sum up, you can use += to sum the values in loop.
If you want to sum up only numeric values, you can use is_numeric() as well.
$i=0;
$sum=0;
while($row = $result->fetch_assoc()) {
$prijs = $row['prijs'];
$sum += $prijs;
$i++;
}
echo $i; //will give you count
echo $sum; //will give you sum

Answer 2

I think you've got your wording mixed up and you mean summing up the values of $prijs, in that case, use a new variable and add to it:
$sum = 0;
foreach($_COOKIE as $key => $value) {
$sql = "SELECT * FROM producten WHERE id='$key'";
$result = mysqli_query($conn, $sql);
while($row = $result->fetch_assoc()) {
$prijs = $row['prijs'];
echo $prijs;
$sum += $prijs;
}}

Answer 3

As per your code, $prijs will only returns single value, so when ever you are trying to count it will only gives a 1. But if you want to set all the values come up and store as an array please try $prijs[] = $row['prijs']

Answer 4

try
$i=0;
foreach($_COOKIE as $key => $value) {
$sql = "SELECT * FROM producten WHERE id='$key'";
$result = mysqli_query($conn, $sql);
while($row = $result->fetch_assoc()) {
$prijs = $row['prijs'];
echo $prijs;
$i++;
echo $i;
}
}

Answer 5

You can simplify your code as follows:
$values = array_map('mysqli_real_escape_string', array_keys($_COOKIE));
$sql = "SELECT * FROM producten WHERE id in ('".implode("','",$values."')";
$result = mysqli_query($conn, $sql);
while($row = $result->fetch_assoc()) {
$prijs = $row['prijs'];
echo $prijs;
}
echo "Total rows: ".$result->num_rows;