You get the error because you are trying to turn a stdClass object into a string, something it doesn't support.

Instead of echo $decoded_traces try var_dump($decoded_traces) - that will give a diagnostic view of the object you've decoded (which I presume is what you wanted). You should find it looks like this

class stdClass#1 (2) {
  public $Coords =>
  array(5) {
    [0] =>
    class stdClass#2 (4) {
      public $Accuracy =>
      string(2) "65"
      public $Latitude =>
      string(18) "53.277720488429026"
      public $Longitude =>
      string(18) "-9.012038778269686"
      public $Timestamp =>
      string(39) "Fri Jul 05 2013 11:59:34 GMT+0100 (IST)"
    }
    [1] => (more of the same, edited for brevity)
    [2] =>
    [3] =>
    [4] =>
  }
  public $Scan =>
  string(8) "Whatever"
}

By default, json_encode will create stdClass objects like the above. If you would prefer an associative array, pass true as the second parameter to json_decode, e.g. $decoded_traces=json_decode($traces, true);

As a further aside, although stdClass can't be turned into a string, your own classes can - a class which implements the __toString magic method could be converted to a string!

Use the (string) method to cast a type in to the type string. For example:

$x = (string) $stdVar->relationship->source->screen_name;

var_dump($x); // will output string(n) "damisleq"

by the way, if you get the result from Twtter as JSON you can also use associative array function in json_decode. For example. $result = json_decode($string, true); the true states you want a array as result in stead of a stdObject.

This will solve your purpose. let me know if anything goes wrong.

$ids[135][0]->ID = 145;
$ids[135][1]->ID = 135;
$ids[135][2]->ID = 155;
$ids[140][0]->ID = 125;
$ids[140][1]->ID = 135;
$idss = array();
foreach($ids as $k => $v) {
   for($i = 0; $i < count($v); $i++) {
        if(!@$idss[$k] || $v[$i]->ID > $idss[$k])
        {
            $idss[$k] = $v[$i]->ID;
        }
    }
 }
 echo "<Pre>";
 print_r($idss);
 die;

I can't comment, because I don't have that amount of reputation, but I'll try to answer...

I'm assuming you want to remove the stdClass from the PHP array?

If so, then make sure you are using true when decoding the JSON.

Example: $array = json_decode($json, true);

For more information on stdClass, see this SO post: What is stdClass in PHP?

Again, forgive me if I'm misinterpreting your question, I just wish I could comment...

You can tailor how your object is represented as a string by implementing a __toString() method in your class, so that when your object is type cast as a string (explicit type cast $str = (string) $myObject;, or automatic echo $myObject) you can control what is included and the string format.

If you only want to display your object's data, the method above would work. If you want to store your object in a session or database, you need to serialize it, so PHP knows how to reconstruct your instance.

Some code to demonstrate the difference:

class MyObject {

  protected $name = 'JJ';

  public function __toString() {
    return "My name is: {$this->name}\n";
  }

}

$obj = new MyObject;

echo $obj;
echo serialize($obj);

Output:

My name is: JJ

O:8:"MyObject":1:{s:7:"*name";s:2:"JJ";}

Why Issue ? After getting $category

 $category=DB::table('categories')->get(['id','name']);

$category is an array

What You should do ? You can't just do foreach inside it or do join

Lazy Way : (foreach)

$sub = '';
foreach($category as $cat)
{
     $sub.=DB::table('subcategory')->where('category_id','=',$cat->id)->get(['id','name','category_id']);
}
return view ('contents.in')->with('category',$category)->with('sub',$sub);

Now $sub will have your expected result.

I am not sure about your table structure so just i just did a foreach ;) But i want you do use join

Recommendation :

1. Use Eloquent

2. Use Joins

Update :

Here is the fiddle that you require.

cars & phones are the two array that we pass from the controller

cars=new Array("Mercedes","Volvo","BMW","porche");
phones=new Array('Samsung','Nokia','Iphone');

populateSelect();

$(function() {

      $('#cat').change(function(){
        populateSelect();
    });

});


function populateSelect(){
    cat=$('#cat').val();
    $('#item').html('');


    if(cat=='car'){
        cars.forEach(function(t) { 
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='phone'){
        phones.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

} 

The print_r is a function is should be called like this:

print_r($array);

You can transform the class to string using the function serialize.

print_r(serialize($array));

Or if you want to get just the values of the array you can use the function implode:

print_r(implode(', ', $array));

This function will transform the values of the array in a string separated by comma. The first param of the implode is the separator and the second is the array that will be converted by string.

If you want to have both, name and value of array. You can do this:

//variable that will storage the string
$string = "";

/** this loop will run all the array, the $key variable will storage the name of 
 *the array position(the key), the $value variable will storage the value of the 
 *array in that position
 */
foreach ($array as $key => $value) {
    $string .= $key . ": " . $value . ", ";
}

print_r($string);

You can loop through an stdclass object like through an array.

foreach($obj as $k => $v)
  // ToDo

If you want it as an array, you can easily cast the object properties (in case of stdclass there are only properties) into array:

$arr = (array) $obj;

This works, creating the associate array and passing true to json_decode:

$string = '{"status": "success", "count": 3, "data": [{"id": 112233}]}';
$object = (object)json_decode($string, true);
var_dump($object);

object(stdClass)#1 (3) { ["status"]=> string(7) "success" ["count"]=> int(3) ["data"]=> array(1) { [0]=> array(1) { ["id"]=> int(112233) } } }