使用PHP在JSON数组中创建数组

Question

I am trying to replicate this json file using PHP but I cannot seem to get the array for object "location" within another array called "levels"

"levels": [
    {
        "id": "lower",
        "title": "Floor 26",
        "map": "images/apartment/upper.jpg",
        "minimap": "images/apartment/upper-small.png",
        "locations": [

            {
                "id": "1",
                "title": "Kitchen",
                "about": "",
                "description": "<img src=\"images/logo.png\" 
                 alt=\"sdfsfs\"><p>aaaaaaaaaaaaaa<p>",
                "category": "furniture",
                "x": "0.4746",
                "y": "0.2883",
                "zoom": "1"
            },

This is what I have so far.

$connect1 = new mysqli("localhost", "root", "root", "location");
$result1 = mysqli_query($connect1, "SELECT * FROM locations");

$connect2 = new mysqli("localhost", "root", "root", "Floors");
$result2 = mysqli_query($connect2, "SELECT * FROM levels");


$data = array(); 
$levels = array();

while($row = mysqli_fetch_array($result2, MYSQLI_ASSOC)){
    $levels[] = $row;
}

  $data["levels"] = $levels;   

  $locations = array();


    while($row = mysqli_fetch_array($result1, MYSQLI_ASSOC)){
    $locations[] = $row;
    }

    $data["locations"] = $locations;

This is the output

"levels": [
    {
        "id":"1",
        "title":"Floor26",
        "map":"images\/apartment\/upper.jpg",
        "minimap":"images\/apartment\/upper-small.png"
    }
],
"locations": [
    {

The problem is I want locations to be an array within the category of levels as shown in the json file rather than levels array being closed after the data has been inserted. Please help. I am a complete beginner, so any advice will be appreciated.

Answer 1

First, use more descriptive variable names. They're easier to read and understand.

Second, add the locations to the levels array in a nested loop:

---

Edit: Actually, you don't need to nest the loops, since the locations are the same for every level. If you were querying for different locations each time, or changing which locations you imported based on level, nesting would make sense.

$locationConnect = new mysqli("localhost", "root", "root", "location");
$locationsResult = mysqli_query($locationConnect, "SELECT * FROM locations");

$levelsConnect = new mysqli("localhost", "root", "root", "Floors");
$levelsResult = mysqli_query($levelsConnect, "SELECT * FROM levels");

$data = array(); 
$levels = array(); 
$locationsArray = array();

//actually since locations appear to be the same for all results, you don't need to nest the loops, this is more efficient:
//loop location results and build locations array:
while($locationRow = mysqli_fetch_array($locationResult, MYSQLI_ASSOC)){
    $locationsArray[] = $locationRow;
}

while($levelRow = mysqli_fetch_array($levelsResult, MYSQLI_ASSOC)){        
    //add locations array to your level row:
    $levelRow["locations"] = $locationsArray;
    //add level row to your levels array
    $levels[] = $levelRow;
}

$data["levels"] = $levels;  

//are you using this for something else? $employee_data seems to be a new array
$employee_data["locations"] = $locationsArray;