How to send an array of objects in JSON format from PHP

Question

New to php. I am trying to send JSON data to front end in name-value pair. I tried an example which I got here The following is my code fragment which sends the data in JSON name value format.

while($stmt->fetch()){
    $list = array('id' => $fid, 'name' => $fname);
}
$stmt->free_result();
$stmt->close();
echo json_encode($list);

I got this on front-end

Object {id: 12, name: "Manisha"}

The problem is I was expecting an array of objects. The above value is the last value obtained from the SQL query. What are the alterations I should make to this code so that I can get an array of objects. Something like

[{"id":"1","name":"Kumari"}, {"id":"2","name":"KM"}, {"id":"3","name":"Manisha"}]

Please advice.

since $list is defined as an array of values, I would have thought you wouldn't get an Object on the front end, but Array [id:12, name:"Manisha"] — Waygood
– Waygood, Commented Mar 25, 2013 at 15:51

Jose Armesto · Accepted Answer · 2013-03-25 15:40:42Z

23

$list needs to be an array, and you can just push items to it like in this code:

$list = array();
while($stmt->fetch()){
    $list[] = array('id' => $fid, 'name' => $fname);
}
$stmt->free_result();
$stmt->close();
echo json_encode($list);

You could also use the method fetch_all() to get all rows at once, instead of iterating with a loop. Although in this example you'd get all fields that you've selected, instead of just id and name.

$list = $stmt->fetch_all();
$stmt->free_result();
$stmt->close();
echo json_encode($list);

answered Mar 25, 2013 at 15:40

Jose Armesto

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Panagiotis Moustafellos · Accepted Answer · 2013-03-25 15:55:10Z

4

You should try pushing each object at the end of array like adding to a stack using array_push (the equivalent of $array[] = $data, but makes it more readable to you).

$list=array(); //instantiate the array 
while($stmt->fetch()){
    $data = new stdClass(); // create a new object
    $data->id=$fid;
    $data->name=$fname;
    array_push($list,$data); // push object to stack array
}
$stmt->free_result();
$stmt->close();
echo json_encode($list);

answered Mar 25, 2013 at 15:55

Panagiotis Moustafellos

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Comments

m79lkm · Accepted Answer · 2013-03-25 15:42:09Z

2

Your list array is only storing 1 row. Try this:

while ($stmt->fetch()) {
    $list[] = array('id' => $fid, 'name' => $fname);
}

Hope this helps!

answered Mar 25, 2013 at 15:42

m79lkm

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Comments

Waygood · Accepted Answer · 2013-03-25 15:45:24Z

2

try creating an array of objects

$list = array();
while($stmt->fetch()) {
    // create an object
    $datum=new stdClass();
    $datum->id=$fid;
    $datum->name=$fname;

    $list[] = $datum;
}
$stmt->free_result();
$stmt->close();
echo json_encode($list);

answered Mar 25, 2013 at 15:45

Waygood

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atwright147 · Accepted Answer · 2013-03-25 15:43:14Z

0

See if this works for you:

$n = 0;
while($stmt->fetch()){
    $list[$n] = array('id' => $fid, 'name' => $fname);
    $n++;
}
$stmt->free_result();
$stmt->close();
echo json_encode($list);

You were overwriting the $list multiple times with an array.

answered Mar 25, 2013 at 15:43

atwright147

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Shadoworker · Accepted Answer · 2016-02-23 17:50:15Z

Let's suppose we have this file structure without specific Objects inside :

  {
    "Subjects" : []
  }



//Get your Json file and decode it 
$json = file_get_contents('CdStore/Pagetest.json');
$json_data = json_decode($json,true);

   //Specifiy your Objects like this
$NewArray= array( 'Mathematics' => array(),'Physics' => array());
  //Push the new Objects  
array_push($json_data['Pagess'],$NewArray); 
   //Then encode to json
$array = json_encode($json_data); 
  //If you want to get the preview before saving
print_r($array);  

 //Save your file
file_put_contents('CdStore/Pagetest.json', json_encode($json_data));

As result you have :

 {"Subjects":
     [
       {
        "Mathematics":[],

        "Physics":[]

         }
     ]

  }

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