如何在php中将数组列表转换为JSON数组？

Question

I am using fonoapi to display contents into my android app using volley. Volley requires data to be in JSON format while the php code returns data as an array(later modified by me but not getting proper JSON).

Here is the php -

<?php

    include_once("fonoapi-v1.php");

    $apiKey = "apiKey";
    $fonoapi = fonoApi::init($apiKey);

        try {

            $res = $fonoapi::getDevice("Samsung");

            foreach ($res as $mobile) {

                                $arr = [];
                                $arr['Device'] = $mobile->DeviceName;
                                $arr['Brand'] = $mobile->Brand;
                                $arr['Cpu'] = $mobile->cpu;
                                $arr['Status'] = $mobile->status;
                                $arr['Dimensions'] = $mobile->dimensions;
                                $arr['4g'] = $mobile->_4g_bands;
                        $json_arr = json_encode($arr);
                                echo $json_arr;

            }

        } catch (Exception $e) {
            echo "ERROR : " . $e->getMessage();
        }

?>

Here is the response i am getting from php -

{
    "Device": "Samsung SGH-250",
    "Brand": "Samsung",
    "Cpu": null,
    "Status": "Discontinued",
    "Dimensions": "124 x 48 x 25 mm (4.88 x 1.89 x 0.98 in)",
    "4g": null
} {
    "Device": "Samsung SGH-500",
    "Brand": "Samsung",
    "Cpu": null,
    "Status": "Discontinued",
    "Dimensions": "112 x 48 x 19 mm (4.41 x 1.89 x 0.75 in)",
    "4g": null
} {
    "Device": "Samsung SGH-600",
    "Brand": "Samsung",
    "Cpu": null,
    "Status": "Discontinued",
    "Dimensions": "108 x 44 x 21 mm (4.25 x 1.73 x 0.83 in)",
    "4g": null
}

There are more results, i am showing only 3. I want the proper json format required to be printed like shown below -

{
    domain : [
        {
            Device : "Samsung SGH-250",
            Brand : "Samsung",
            Cpu : null,
            Status : "Discontinued",
            Dimensions : "124 x 48 x 25 mm (4.88 x 1.89 x 0.98 in)",
            4g : null
        },
        {
            Device : "Samsung SGH-500",
            Brand : "Samsung",
            Cpu : null,
            Status : "Discontinued",
            Dimensions : "112 x 48 x 19 mm (4.41 x 1.89 x 0.75 in)",
            4g : null
        },
        {
            Device : "Samsung SGH-600",
            Brand : "Samsung",
            Cpu : null,
            Status : "Discontinued",
            Dimensions : "108 x 44 x 21 mm (4.25 x 1.73 x 0.83 in)",
            4g : null
        }
    ]
}

Answer 1

Try to gather all data before using echo:

$response = array();

    try {

        $res = $fonoapi::getDevice("Samsung");

        foreach ($res as $mobile) {

                            $arr = [];
                            $arr['Device'] = $mobile->DeviceName;
                            $arr['Brand'] = $mobile->Brand;
                            $arr['Cpu'] = $mobile->cpu;
                            $arr['Status'] = $mobile->status;
                            $arr['Dimensions'] = $mobile->dimensions;
                            $arr['4g'] = $mobile->_4g_bands;

                    $response[] = $arr;

        }

    } catch (Exception $e) {
        echo "ERROR : " . $e->getMessage();
    }

    echo json_encode(array('domain'=>$response));

Answer 2

You're echoing out one Json converted array at a time. What you need to do is make one larger array that contains all of the data and then convert that one larger array.

<?php

include_once('fonoapi-v1.php');

$apiKey = 'apiKey';
$fonoapi = fonoApi::init($apiKey);

try {

    $res = $fonoapi::getDevice('Samsung');

    $phones = array();

    foreach($res as $mobile) {
        $phones[] = array(
            'Device' => $mobile->DeviceName,
            'Brand' => $mobile->Brand,
            'Cpu' => $mobile->cpu,
            'Status' => $mobile->status,
            'Dimensions' => $mobile->dimensions,
            '4g' => $mobile->_4g_bands
        );
    }

    $json_arr = json_encode($phones);
    echo $json_arr;

} catch (Exception $e) {
    echo 'ERROR : ', $e->getMessage();
}

Answer 3

To achieve the example reference you provided you can do something like this (gist of the code you need to change):

$response = [];
$response['domain'] = [];

foreach ($res as $mobile)
{
    $arr = [];
    $arr['Device'] = $mobile->DeviceName;
    $arr['Brand'] = $mobile->Brand;
    $arr['Cpu'] = $mobile->cpu;
    $arr['Status'] = $mobile->status;
    $arr['Dimensions'] = $mobile->dimensions;
    $arr['4g'] = $mobile->_4g_bands;

    $response['domain'][] = $arr;
}

echo json_encode($response);

Answer 4

try this

$domain = array();
foreach ($res as $mobile) {

                            $arr = [];
                            $arr['Device'] = $mobile->DeviceName;
                            $arr['Brand'] = $mobile->Brand;
                            $arr['Cpu'] = $mobile->cpu;
                            $arr['Status'] = $mobile->status;
                            $arr['Dimensions'] = $mobile->dimensions;
                            $arr['4g'] = $mobile->_4g_bands;
                    //$json_arr = json_encode($arr);
                            //echo $json_arr;
$domain[] = $arr;

        }
echo json_encode(array('domain' => $domain));