PHP json_encode() specific key of an array

Question

I am using PHP 5.5.12.

I have an array like:

Array
(
    [0] => Array
        (
            [user_id] => 3
            [medicine_id] => 1
            [time] => Array
                (
                    [0] => stdClass Object
                        (
                            [event_type] => before_breakfast
                            [time] => 07:00:00
                        )

                    [1] => stdClass Object
                        (
                            [event_type] => after_breakfast
                            [time] => 07:30:00
                        )

                )

        )

    [1] => Array
        (
            [user_id] => 3
            [medicine_id] => 2
            [time] => Array
                (
                    [0] => stdClass Object
                        (
                            [event_type] => before_lunch
                            [time] => 13:00:00
                        )

                    [1] => stdClass Object
                        (
                            [event_type] => after_lunch
                            [time] => 14:00:00
                        )

                )

        )

    [2] => Array
        (
            [user_id] => 3
            [medicine_id] => 3
            [time] => Array
                (
                    [0] => stdClass Object
                        (
                            [event_type] => before_dinner
                            [time] => 20:00:00
                        )

                    [1] => stdClass Object
                        (
                            [event_type] => after_lunch
                            [time] => 21:00:00
                        )
                )
        )
)

I want to json_encode() the field time of each root level.

I tried using:

foreach ($user_medicine_times as $user_medicine_key => $user_medicine_value) {
    $user_medicine_value['time'] = json_encode($user_medicine_value['time'], true);
}

and:

foreach ($user_medicine_times as $user_medicine_key => &$user_medicine_value) {
    $user_medicine_value['time'] = json_encode($user_medicine_value['time'], true);
}

But using print_r($user_medicine_value), it returns the same array.

I want the result to be as follows:

Array
(
    [0] => Array
        (
            [user_id] => 3
            [medicine_id] => 1
            [time] => "[{"event_type":"before_breakfast","time":"07:00:00"},{"event_type":"after_breakfast","time":"07:30:00"}]"

        )

    [1] => Array
        (
            [user_id] => 3
            [medicine_id] => 2
            [time] => "[{"event_type":"before_lunch","time":"13:00:00"},{"event_type":"after_lunch","time":"17:00:00"}]"

        )

    [2] => Array
        (
            [user_id] => 3
            [medicine_id] => 3
            [time] => "[{"event_type":"before_dinner","time":"20:00:00"},{"event_type":"after_lunch","time":"17:00:00"}]"

        )

)

How can I achieve this result?

You've asked a similar question today and apparently deleted that question, why ?! We have bounty's if you think your question didn't receive enough attention. — Daan
– Daan, Commented Jul 20, 2015 at 12:45
Its better to make a new array consisting only the values of [time] and then use json_encode — Narendrasingh Sisodia
– Narendrasingh Sisodia, Commented Jul 20, 2015 at 12:46
The question I deleted was to something related to filter an array and replace specific key value, I've achieved it. This is regarding convert specific key value to JSON. Bounties are eligible after 2 days. I cannot wait for that long if working on deadline. Also, without providing existing solution, down vote is arrogance I think that I've deleted it. — Dev
– Dev, Commented Jul 20, 2015 at 12:47

Disha V. · Accepted Answer · 2015-07-20 13:12:53Z

1

I have read your question earlier and prepared the answer but you removed it before i paste the answer. Anyways here is the solution

function outer(&$val, $key) {
    $val['time'] = json_encode($val['time']);
}
array_walk($your_array, 'outer');
print_r($your_array);

answered Jul 20, 2015 at 13:12

Disha V.

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Comments

Marius · Accepted Answer · 2015-07-20 12:50:25Z

0

You can replace your foreach loop's content with something like this:

foreach ($user_medicine_times as $user_medicine_key => $user_medicine_value) {
    $user_medicine_times[$user_medicine_key]['time'] = json_encode($user_medicine_value['time'], true);
}

answered Jul 20, 2015 at 12:50

Marius

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Comments

Nicolas D · Accepted Answer · 2015-07-20 12:54:38Z

0

Maybe the json encode fails because your time array contains an stdClass Object. Try to convert this like that :

$result = array();
foreach ($user_medicine_value['time'] as $value) {
    $result['event_type'] = $value->event_type;
    $result['time'] = $value->time;
}
$user_medicine_value['time'] = $result;

answered Jul 20, 2015 at 12:54

Nicolas D

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Comments

dialogik · Accepted Answer · 2015-07-20 13:17:59Z

0

Because, in every iteration, the value is not being saved anywhere,

You have two options here, either make new array having time key with json_encode() or pass the value by reference as shown below.

foreach ($user_medicine_times as $user_medicine_key => &$user_medicine_value) {
                                                       ^
    $user_medicine_value['time'] = json_encode($user_medicine_value['time'], true);
}

edited Jul 20, 2015 at 13:17

dialogik

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answered Jul 20, 2015 at 12:50

Viral

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1 Comment

Dev Over a year ago

Because of &$user_medicine_value it gives error : Invalid argument supplied for foreach(). And using true in json_encode also not affecting the provided array. It returns the same array I've used as an input.

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