How to read from JSON object array in php?

Question

I have an html code as shown below. The following html code displays list of checkboxes as shown in the screenshot below the code.

 <?php      
        $output['toggle_multi_tiles']=$_POST['toggle_multi_tiles'];  

        $output['episode_status']=$_POST['episode_status'];

        $fp = fopen('../feeds/ptp-ess_landing.json', 'w');
        fwrite($fp, json_encode($output));
        fclose($fp);
        logActivity();

        if(file_exists('../feeds/ptp-ess_landing.json')){
        $data = json_decode(file_get_contents('../feeds/ptp-ess_landing.json'));
        }
 ?>

 <?php if($data){
 ?>
    <fieldset style="background-color:darkseagreen;">
       <input type="checkbox" id="ptp" value="0" name="toggle_multi_tiles[]" <?php if($data->{"toggle_multi_tiles[]"}==0){echo
          'checked';}?>>
       <label for="toggle-multi-off">PTP</label>
       <input type="checkbox" id="l'e" value="1" name="toggle_multi_tiles[]" <?php if($data->{"toggle_multi_tiles[]"}==1){echo
          'checked';}?>>
       <label for="position-one">L'E</label>
       <div>
          <button type="submit">Save</button>   //Line A
       </div>
    </fieldset>
<?php }  ?>

On hitting save button at Line A after selecting the first 2 check-boxes from the screenshot above , everything get save in JSON as shown below:

{"toggle_multi_tiles":["0","1"]}

Problem Statement:

The issue which I am having right now is after saving the 2 check-boxes, the only check-box which display on page refresh is the 1st one (not both).

($data->{"toggle_multi_tiles[]"}==0) from the html code is reading from JSON.

($data->{"toggle_multi_tiles[]"}==1) from the html code is reading from JSON.

What do you think $data->{"toggle_multi_tiles[]"}==1 does? — Dharman
– Dharman ♦, Commented Jul 31, 2019 at 21:21
I would like you to explain the logic of this statement. It does not read JSON. It compares a property of an object to an integer 1. Rubber duck debugging is usually a very good method. — Dharman
– Dharman ♦, Commented Jul 31, 2019 at 21:24
Where do you see the values {"toggle_multi_tiles":["0","1"]}? In browser's console or in PHP? — Dharman
– Dharman ♦, Commented Jul 31, 2019 at 21:26
On page refresh, why only first checkbox remains selected ? Why not both (1st and 2nd) ? — flash
– flash, Commented Jul 31, 2019 at 21:26

Barmar · Accepted Answer · 2019-07-31 22:00:22Z

1

The key in your object is toggle_multi_tiles, not toggle_multi_tiles[], so $data->{"toggle_multi_tiles[]"} should be $data->toggle_multi_tiles.

The value of this property is an array of strings, you can use in_array() to test whether a value is in it.

<input type="checkbox" id="ptp" value="0" name="toggle_multi_tiles[]" <?php if(in_array("0", $data->toggle_multi_tiles)){echo
  'checked';}?>>
<label for="toggle-multi-off">PTP</label>
<input type="checkbox" id="l'e" value="1" name="toggle_multi_tiles[]" <?php if(in_array("1", $data->toggle_multi_tiles)){echo
  'checked';}?>>

answered Jul 31, 2019 at 22:00

Barmar

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5 Comments

Barmar Over a year ago

That won't work. Only the values of the checked boxes are sent, so they won't be in specific indexes in the array.

Barmar Over a year ago

If you only check box 1, the array will be ["1"].

flash Over a year ago

Actually its working. But I wanted to check if its the correct approach.

Barmar Over a year ago

It's not the correct approach, I doubt it's really working in all cases.

flash Over a year ago

You are right. Its not working in all case. Whereas your code is working in all cases.

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