如何遍历JSON数组并将数据放入变量

Question

I am trying to get the data from an API and save it to a MySQL database. The problem is when I want to echo the data to check if it gets all the values I'm getting this error:

Notice: Trying to get property of non-object

My JSON data looks like this:

{"AttractionInfo":[{"Id":"sprookjesbos","Type":"Attraction","MapLocation":"1","State":"open","StateColor":"green","WaitingTime":0,"StatePercentage":0},{"Id":"zanggelukkig","Type":"Show","MapLocation":".","State":"gesloten","StateColor":"clear"},

I think this is because it is in an array. Because when I use this bit of code it gives no errors but I have to define the index of the array. What is the best way to loop through my data and put it in variables?

<?php

    //Get content
    $url = "https://eftelingapi.herokuapp.com/attractions";
    $data = json_decode(file_get_contents($url));

    //Fetch data
    $attractieId = $data->AttractionInfo[0]->Id;
    $attractieType = $data->AttractionInfo[0]->Type;
    $attractieStatus = $data->AttractionInfo[0]->State;
    $attractieStatusKleur = $data->AttractionInfo[0]->StateColor;
    $attractieWachttijd = $data->AttractionInfo[0]->WaitingTime;
    $attractieStatusPercentage = $data->AttractionInfo[0]->StatePercentage;

?>

I tried to find some solutions but all they use is a foreach loop. But i don't think that'll work right. Can anyone help me in the good direction or tell me how I might possibly fix this? I am not very experienced so any advice is welcome. Thanks in advance.

Update code:

require 'database-connection.php';
//Get content
$url = "https://eftelingapi.herokuapp.com/attractions";
$data = json_decode(file_get_contents($url));

//Fetch data
$attractieId = isset($data->AttractionInfo->Id);
$attractieType = isset($data->AttractionInfo->Type);
$attractieStatus = isset($data->AttractionInfo->State);
$attractieStatusKleur = isset($data->AttractionInfo->StateColor);
$attractieWachttijd = isset($data->AttractionInfo->WaitingTime);
$attractieStatusPercentage = isset($data->AttractionInfo->StatePercentage);

$sql =  "INSERT INTO attracties (attractieId, attractieType, attractieStatus, attractieStatusKleur, attractieWachttijd, attractieStatusPercentage) 
VALUES ('$attractieId', '$attractieType', '$attractieStatus', '$attractieStatusKleur', '$attractieWachttijd', '$attractieStatusPercentage')";
if ($db->query($sql) === TRUE) {
    echo "success";
} else {
    echo "Error: " . $sql . "<br>" . $db->error;
}

It says 'success' but when I look into my database it inserted only empty data. I need to add all the attractions to my database so not just one row. So I need to loop through my data.

Answer 1

try this...

$content = json_decode(file_get_contents($url));

foreach($content->AttractionInfo as $data ){
      $id      = $data->Id;
      $type    = $data->Type;
      $map     = $data->MapLocation;
      $state   = $data->State;
      $color   = $data->StateColor;
      if(!empty($data->WaitingTime)) {
      $time = $data->WaitingTime;
      }
     if(!empty($data->StatePercentage)) {
       $percent = $data->StatePercentage;
     }

  //persist your data into DB....
}

Answer 2

I think you need something like this:

    $json = '{"AttractionInfo":[{"Id":"sprookjesbos","Type":"Attraction","MapLocation":"1","State":"open","StateColor":"green","WaitingTime":0,"StatePercentage":0},{"Id":"zanggelukkig","Type":"Show","MapLocation":".","State":"gesloten","StateColor":"clear"}]}';
    $arr = json_decode($json);

     foreach ($arr->AttractionInfo as $key => $attraction) {
       foreach($attraction as $key=> $value) {
          print_r($key.' - '.$value.'<br>');
          $$key = $value;
       }
    }

echo '<br>';
echo $Id; // it will be last item/attraction id.

We can improve this code. Just say where and how do you want to use it