JSON Send empty array

Question

When trying to send an array, and I know that the array contains data because I checked with var_dump, the json_encode does not send any data. This is my code:

for($i=0;$i<count($dados_atividades)-1;$i++)
    {
        $arr[$i+1]['Descricao'] = $dados_atividades[$i]['Descricao'];
        $arr[$i+1]['DataInicioPrevista'] = $dados_atividades[$i]['DataInicioPrevista'];
        $arr[$i+1]['DataConclusaoPrevista'] = $dados_atividades[$i]['DataConclusaoPrevista'];
    }
    if(count($arr)>0) {
        echo json_encode($arr);
    }else{
        $arr = array();
        $arr[0]['Descricao'] = 'N/A';
        echo json_encode($arr);
    }

As you can see in the picture, the response does not contain any php echo

and this is my code with var_dump:

for($i=0;$i<count($dados_atividades)-1;$i++)
    {
        $arr[$i+1]['Descricao'] = $dados_atividades[$i]['Descricao'];
        $arr[$i+1]['DataInicioPrevista'] = $dados_atividades[$i]['DataInicioPrevista'];
        $arr[$i+1]['DataConclusaoPrevista'] = $dados_atividades[$i]['DataConclusaoPrevista'];
    }
    if(count($arr)>0) {
    var_dump($arr);
        echo json_encode($arr);
    }else{
        $arr = array();
        $arr[0]['Descricao'] = 'N/A';

        echo json_encode($arr);
    }

and as you can see in the picture, the array contains data:

What can I do to fix this?

Is json_encode returning false? Use php.net/manual/en/function.json-last-error.php to determine the cause, if any. — Flosculus
– Flosculus, Commented Jan 11, 2016 at 12:54
Could it be possible that the echo and json_encode is working but it isnt outputting to the page you are seeing? Also, try a var_dump(json_encode($arr)) and see what happens — Martin Currah
– Martin Currah, Commented Jan 11, 2016 at 12:59
@MartinCurrah The point is that it works with small arrays, with 10 sizes +/- — Tiago Rocha
– Tiago Rocha, Commented Jan 11, 2016 at 13:12
@MartinCurrah with var_dump (json_encode ($ arr)), give me bool (false) — Tiago Rocha
– Tiago Rocha, Commented Jan 11, 2016 at 13:14
SHow us what goes on just before you start the piece of code you have shown us — RiggsFolly
– RiggsFolly, Commented Jan 11, 2016 at 13:43

Martin Currah · Accepted Answer · 2016-01-11 14:31:41Z

1

To expand upon the previous answer you need to encode the array data to UTF-8

function utf8_converter($array)
{
    array_walk_recursive($array, function(&$item, $key){
        if(!mb_detect_encoding($item, 'utf-8', true)){
            $item = utf8_encode($item);
        }
    });

    return $array;
}

edited Jan 11, 2016 at 14:31

answered Jan 11, 2016 at 14:01

Martin Currah

5171 gold badge5 silver badges15 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

RiggsFolly Over a year ago

Thanks for the reminder, but this code actually generates 3 Warnings

Tiago Rocha Over a year ago

give me warning like this: "b>Warning</b>: htmlentities() expects parameter 1 to be string,"

Martin Currah Over a year ago

I have updated the code. Run $arr through this function before echoing it

RiggsFolly · Accepted Answer · 2016-01-11 14:12:44Z

0

Instead of echoing out the json each time round the loop, build the array in the loop and then echo the json once it has completed.

The browser is expecting to see one reply to the AJAX call and not multiple replies.

for($i=0;$i<count($dados_atividades)-1;$i++)
{
        $arr[$i+1]['Descricao'] = $dados_atividades[$i]['Descricao'];
        $arr[$i+1]['DataInicioPrevista'] = $dados_atividades[$i]['DataInicioPrevista'];
        $arr[$i+1]['DataConclusaoPrevista'] = $dados_atividades[$i]['DataConclusaoPrevista'];
    }
}

if(count($arr) == 0) {
    $arr = array();
    $arr[]['Descricao'] = 'N/A';
}

$json_string = json_encode($arr,JSON_UNESCAPED_UNICODE);

if ( json_last_error() > 0 ) {
    file_put_contents('json_debug.txt', json_last_error_msg() );
} else {
    echo $json_string;
}
exit;

It sounds like you are getting a Malformed UTF-8 characters, possibly incorrectly encoded error, so change this line like so

$json_string = json_encode($arr,JSON_UNESCAPED_UNICODE);

edited Jan 11, 2016 at 14:12

answered Jan 11, 2016 at 13:12

RiggsFolly

94.7k22 gold badges108 silver badges152 bronze badges

2 Comments

Tiago Rocha Over a year ago

Same thing, because the array contains data

Tiago Rocha Over a year ago

same error in the txt file: Malformed UTF-8 characters, possibly incorrectly encoded

Collectives™ on Stack Overflow

JSON Send empty array

2 Answers 2

3 Comments

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related