how to decode json object using php

Question

I am getting following result from database:

stdClass Object ( [risk_challenge] => ["dfsgdfgdgdf","dfgdfgdfg","dfgdfgdfgdf"] )

When I tried to decode it with following function:

$result = json_decode($result,true);

I got this error:

Message: json_decode() expects parameter 1 to be string, object given

If it's an object, you've already decoded it. An instance of stdClass is a bona-fide PHP object, which you can iterate over, or access its members directly ($obj->risk_challenge[0], for example) — Elias Van Ootegem
– Elias Van Ootegem, Commented Oct 14, 2014 at 10:18
You got your answer in your error message. You need to get string from database result to decode it, and you are giving object to it instead of string. — Luka Krajnc
– Luka Krajnc, Commented Oct 14, 2014 at 10:22

Elias Van Ootegem · Accepted Answer · 2014-10-14 10:22:55Z

1

What you have is a valid object, there's nothing JSON about it, it's an instance of the core stdClass class of PHP. If you want to use it (for example get list the risk_challenge values) simply write:

foreach ($obj->risk_challenge as $value)
    echo ' *> ', $value, PHP_EOL;

Job done.
If you want to convert the object to an associative array, you have 2 options:

$array = (array) $object;//a simple cast
$array = json_decode( //decode with assoc argument = true
    json_encode(// but first encode it
        $object
    ), true);

Why would you use the second version instead of the cast? simple: A cast is shallow (if any of the properties/keys contains another object, it will not be cast to an associative array, but it'll remain an object. json_decode does work recursively. In your case, though, I'd stick to the cast.

answered Oct 14, 2014 at 10:22

Elias Van Ootegem

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2 Comments

kalavathi Over a year ago

how to call bootstrap modal in codeigniter controller function

Elias Van Ootegem Over a year ago

@kalavathi: That's a different question all together, and probably one that has already been asked (or the answer to which is easily found in the manual).

Sohail Yasmin · Accepted Answer · 2014-10-14 10:19:03Z

0

I think you want to encode in json it is already decoded

use json_encode to encode

answered Oct 14, 2014 at 10:19

Sohail Yasmin

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