'Object of class stdClass could not be converted to string error

I have the following string:

{"Coords":[{"Accuracy":"65","Latitude":"53.277720488429026","Longitude":"-9.012038778269686","Timestamp":"Fri Jul 05 2013 11:59:34 GMT+0100 (IST)"},{"Accuracy":"65","Latitude":"53.277720488429026","Longitude":"-9.012038778269686","Timestamp":"Fri Jul 05 2013 11:59:34 GMT+0100 (IST)"},{"Accuracy":"65","Latitude":"53.27770755361785","Longitude":"-9.011979642121824","Timestamp":"Fri Jul 05 2013 12:02:09 GMT+0100 (IST)"},{"Accuracy":"65","Latitude":"53.27769091555766","Longitude":"-9.012051410095722","Timestamp":"Fri Jul 05 2013 12:02:17 GMT+0100 (IST)"},{"Accuracy":"65","Latitude":"53.27769091555766","Longitude":"-9.012051410095722","Timestamp":"Fri Jul 05 2013 12:02:17 GMT+0100 (IST)"}],"Scan":"Whatever"}

Which I want to decode in php. The string is obtained via a sql query. See code below:

$TrackDetails_Query= "SELECT * FROM Tracks WHERE TrackID='".$TrackNum."' ORDER BY TrackID DESC";

        $TrackDetails_Result= mysql_query($TrackDetails_Query) or die (mysql_error());

        if (mysql_num_rows($TrackDetails_Result)==0){
                echo 'There are no tracks for the number entered';
            }
        else{
                            $traces=$row['Traces'];
                            $decoded_traces=json_decode($traces);
                            echo $decoded_traces;
            }
    }

But I am getting the error:

Catchable fatal error: Object of class stdClass could not be converted to string
phpjsonstringobject


Solution 1:[1]

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!

Solution 2:[2]

use json_encode($traces) this will convert the array into the string. json_decode() is used to convert a string into array or object array

Solution 3:[3]

Try using this $decoded_traces=json_decode($traces, true);

instead of this $decoded_traces=json_decode($traces);

It will convert your stdClass to array. Note that $decoded_traces is array then you can use as you require.

Solution 4:[4]

It was an old question, still answer to make it clear for someone who just encounters it like me.

try json_encode($traces);

in my case

return var_dump(json_encode($result[0]));

the result is:

string(34) "{"id":1,"content":"test database"}"

Solution 5:[5]

Instead of 

 $decoded_traces=json_decode($traces);
 echo $decoded_traces;

try

$decoded_traces=json_decode($traces, true);
print_r $decoded_traces;

Solution 6:[6]

$decoded_traces is an object. You cannot simply echo an object, because that makes no sense.

If you want to debug the object, use var_dump($decoded_traces).

Solution 7:[7]

I've noticed that it can happen in wordpress too if you are using the $wpdb->get_row() method and you miss adding the last parameter

You just need to add another parameter at the end of the function, so you'll get

$res = $wpdb->get_row("SELECT * FROM wp_options WHERE option_id = 1" ,ARRAY_A) which will output an array instead of an stdClass then you just have to use it like this

$res['option_value']

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1
Solution 2 Nabeel Arshad
Solution 3 dakshbhatt21
Solution 4 serena feng
Solution 5 emmanuel agarry
Solution 6 deceze
Solution 7 Gui

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