<?php

$DATAhst="localhost";
$DATAusr="root";
$DATApwd="root";
$DATAdtb="vds";

$conn=@mysqli_connect($DATAhst, $DATAusr, $DATApwd, $DATAdtb)or die("CONNECTION ERROR");
mysqli_set_charset($conn, "utf8");

$query="SELECT * FROM questions";
$q=mysqli_query($conn, $query);
$data=array();
$answers=array();

class Answer {}

while($r=mysqli_fetch_array($q)) {

  $answers=[];
  $answers_unserializes = unserialize($r['answers']);
  foreach ($answers_unserializes as $key => $value) {
    $answer = new Answer();
    $answer->id = trim($key);
    $answer->text = trim($value);
    if($key == $r['correct']){$answer->correct = true;}
    $answers[] = $answer;
  }

  $data[] =  array(
    "id" => trim($r['id']),
    "question" => trim($r['question']),
    "answers" => $answers
  );

}

header('Content-type: application/json');
echo json_encode( $data );

?>