How to extract data from a JSON array to variables and pass variables to a PHP function

Question

I have a Java Program that sends a HTTP POST request to a PHP file. I need the PHP script to extract the JSON data to some variables and call a PHP function with those variables (parameters). Please find the PHP code below.

<?php
    if ($_SERVER['REQUEST_METHOD'] == 'POST')
    {
        $data = json_decode(file_get_contents("php://input"), true);
        var_export($data);      
    }
    else
    {
        var_export($_SERVER['REQUEST_METHOD']);
    }
?>

The JSON Object created in Java

JSONObject json = new JSONObject();
json.put("name", "Dash");
json.put("num", new Integer(100));
json.put("balance", new Double(1000.21));

Please help me understand how to extract the JSON array data to variables And how to make the call.

It is returning the JSON array to Java Program. I want the PHP script to make a call to a PHP function. — Pritam, Mar 01 '16 at 02:31
What's wrong with calling the function? `callWhateverFunction($data);` http://stackoverflow.com/questions/8893574/php-php-input-vs-post — Matt, Mar 01 '16 at 02:32

score 0 · Answer 1 · edited May 23 '17 at 12:07

Once you've run json_decode(), $data is just a "normal" php array with "normal" php values in it.
So, e.g.

/*
JSONObject json = new JSONObject();
json.put("name", "Dash");
json.put("num", new Integer(100));
json.put("balance", new Double(1000.21));
=>
*/
// $input = file_get_contents("php://input");
$input = '{"name":"Dash","num":100,"balance":1000.21}';

$data = json_decode($input, true);
$response = array(
    'name_rev'      => strrev($data['name']),
    'num_mod_17'    => $data['num'] % 17,
    'balance_mul_2' => $data['balance'] * 2
);
echo json_encode($response, JSON_PRETTY_PRINT); // you might want to get rid off JSON_PRETTY_PRINT in production code

prints

{
    "name_rev": "hsaD",
    "num_mod_17": 15,
    "balance_mul_2": 2000.42
}

two more tips:

You should test whether $data contains all the elements you expect, before accessing them, see http://docs.php.net/isset , http://docs.php.net/filter et al
a java Double() called balance. A java double is a 64-bit IEEE 754 floating point. And you might hit at one point (if not the range than) the precision limit, see What is the best data type to use for money in java app?

Thanks for taking at look at this. This answer is helpful. Thank you..! — Pritam, Mar 01 '16 at 03:19

How to extract data from a JSON array to variables and pass variables to a PHP function

1 Answers1