Adding the integer values inside JSON using PHP - php

Question

For example I have this JSON.
[{"rate":3},{"rate":4},{"rate":3},{"rate":5}]
What can I do so I can add all the values inside of it in PHP. Thaanks :)
So this is the code goes srry.
<?PHP
include_once("connection.php");
$query = "SELECT rate FROM tbl_ratings WHERE userID = 10";
$result = mysqli_query($conn, $query);
$json = array();
if(mysqli_num_rows($result)){
while($row = mysqli_fetch_assoc($result)){
$json[]=$row;
}
}
mysqli_close($conn);
echo json_encode($json, JSON_NUMERIC_CHECK);
echo array_sum($json, JSON_NUMERIC_CHECK);
?>

Answer 1

You don't need to reconfigure your json string to suit the method -- just add array_column().
Code: (Demo)
// these are subarrays containing 1 element each
$json = '[{"rate":3},{"rate":4},{"rate":3},{"rate":5}]';
// decode it to an array
$array = json_decode($json, true);
// extract the "rate" column values from each subarray and sum them
echo array_sum(array_column($array, 'rate'));
Output:
15
...but honestly, it looks like you have over-complicated the task. Just add it all up using MySQL.
$result = mysqli_query($conn, "SELECT SUM(rate) FROM tbl_ratings WHERE userID = 10");
echo mysqli_fetch_row($result)[0]; //15

Answer 2

<?php
//Your json decode
$json = json_decode($YourJson);
//summation of all elements
$total = array_sum($jaon);
?>

Answer 3

Your JSON in incorrect. It should have proper square brackets. Before 3, there should be opening square bracket and not {
You should do json_decode()
Use array_sum() to get the sum of all values.
Below is the code:
$json = '{"rates": [3,2,3,5,7]}';
$arr = json_decode($json);
echo array_sum($arr->rates);