How to automatically convert json null values to empty string in Codeigniter

Question

I am working with json in Codeigniter and i have some fields which outputs null values i want to change those null values to empty string. I don't want to check every fields one by one.My CI code is like this:

$result= $this->get_model->get_model();
header("content-type: application/json");
$data[] = array('name'=>"result",'data'=>$result);
echo json_encode(array('success'=> 1,'posts'=>$data));
return $result;

once you convert into the the string. Replacae null with empty string — sandeepsure
– sandeepsure, Commented Nov 17, 2015 at 6:09
Can u please explain it with example or give me a link for that — user3653474
– user3653474, Commented Nov 17, 2015 at 6:11
can you let me know what output echo json_encode(array('success'=> 1,'posts'=>$data)); this line prints. — sandeepsure
– sandeepsure, Commented Nov 17, 2015 at 6:14
this is the code snippet : "name":"latest", "data":[ { "timestamp":"2015-11-16 11:34:03", "avg_rating":null } ] — user3653474
– user3653474, Commented Nov 17, 2015 at 6:17

sandeepsure · Accepted Answer · 2015-11-17 06:25:26Z

0

Try this code. It prints json replacing null values with empty

$result= $this->get_model->get_model();
header("content-type: application/json");
$data[] = array('name'=>"result",'data'=>$result);
$data_result = json_encode(array('success'=> 1,'posts'=>$data));

echo str_replace("null","",$data_result);

return $result;

answered Nov 17, 2015 at 6:25

sandeepsure

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8 Comments

user3653474 Over a year ago

I tried the above code but the same null values are coming.

sandeepsure Over a year ago

what my code echo prints, please let me know and what is the value of $data_result

user3653474 Over a year ago

print_r($data_result); it outputs nothing this means there is no value in $data_result.

sandeepsure Over a year ago

$data_result is a string. It is not an array. So, you should use echo

user3653474 Over a year ago

@sandeepsue- I am getting error in json i have uploaded the image where i am getting it.All avg_rating are changing like the above image.

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geisterfurz007 · Accepted Answer · 2019-11-22 17:53:39Z

0

This is the easiest way:

array_walk_recursive($array,function(&$item){$item=strval($item);});

From: https://developertipsandtricks.blogspot.com/2013/10/convert-null-to-empty-string-for-json.html

edited Nov 22, 2019 at 17:53

geisterfurz007

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answered Nov 22, 2019 at 17:52

Carlos Pulgarin

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