如何通过javaScript / jquery从php获取json返回值？

Question

This is my javaScript code :

$(document).ready(function() {
    $('#IMDB').click(function() {  
       var MovieID = $('#MovieID').val();

       $.post('action/action.php', { url: "http://api.themoviedb.org/3/movie/"+MovieID
+"?append_to_response=credits,images&api_key=myapikey" }, function(data) {
           var aliases = data.aliases;  
           document.getElementById('GamesTitle').value = aliases;
       });
    });
});

and this my php code

header('Content-Type: application/json');
    $url = $_POST['url'];
    $context = stream_context_create(['http' => ['user_agent' => 'API Test UA']]);
    $response = file_get_contents($url, false, $context);
    $json = json_decode($response, true);
    foreach($json as $item){
        if($item['aliases'] !== null && $item['aliases'] !== 'O' && $item['aliases'] !== '1'){
            $aliases .= $item['aliases'];  // its give the result fine in php page
        }   
    }

    echo json_encode(array(
      'aliases' => $aliases
    ));
    return true;

but when i click my button to get all information its not getting anything. and i dont get any error in console or anywhere so i can't find my problem.

and when i return value in php page it returns like this - >

O null null null null {my result} 1

thats why i have to skip this O and 1 with

if($item['aliases'] !== null && $item['aliases'] !== 'O' && $item['aliases'] !== '1') {// .... now its ok } 

if you remove this from php it will work fine. like this

header('Content-Type: application/json');
    $url = $_POST['url'];

    echo json_encode(array(
      'aliases' => 'test' /// now its work fine
    ));
    return true;

Answer 1

add ."json"... like:

$(document).ready(function() {
$('#IMDB').click(function() {  
   var MovieID = $('#MovieID').val();

   $.post('action/action.php', { url: "http://api.themoviedb.org/3/movie/"+MovieID+"?append_to_response=credits,images&api_key=myapikey" }, function(data) {
       var aliases = data.aliases;  
       document.getElementById('GamesTitle').value = aliases;
   }, "json");
});
});

now the return data will be interpreted as JSON.