如何从php中的JSON对象数组读取？

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.

Answer 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';}?>>