How to sum json arrays in php

Method for summing json arrays in php: 1. Create a PHP sample file; 2. Define the variable $jsonArrayStr to store the provided JSON array and change it to a string type; 3. Use the "json_decode()" function Decode it into a PHP array for processing; 4. Use the array_reduce() function to iterate the calculated value and return the total result; 5. Echo output and print the result.

Operating system for this tutorial: Windows 10 system, php8.1.3 version, Dell G3 computer.

The method for summing json arrays in PHP is:

Use PHP's built-in json_decode() function to decode it. Then use the array_reduce() function to sum the arrays.

The sample code is as follows:

<?php 
// Your JSON array as a string
$jsonArrayStr = &#39;[{"value": 10}, {"value": 20}, {"value": 30}]&#39;;
// Decode the JSON array into a PHP array
$jsonArray = json_decode($jsonArrayStr, true);
// Use array_reduce() function to sum up all values in the array
$totalSum = array_reduce($jsonArray, function($carry, $item) {
    return $carry + $item[&#39;value&#39;];
});
echo $totalSum; // Output: 60
?>

In the above example, the provided JSON array is first stored as a string in the $jsonArrayStr variable. Then use the json_decode() function to decode it into a PHP array for subsequent processing.

Next, we use the array_reduce() function, which accepts two parameters: the array to be processed and a callback function. The callback function uses the $carry parameter to store the value calculated in the previous iteration, and adds it to the current item's $item['value'] on each iteration, and finally returns the sum result.

Then, just output the result 60 to the screen.

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