json_decode returns NULL after webservice call

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There is a strange behaviour with json_encode and json_decode and I can't find a solution:

My php application calls a php web service. The webservice returns json that looks like this:

var_dump($foo):
string(62) "{"action":"set","user":"123123123123","status":"OK"}"

now I like to decode the json in my application:

$data = json_decode($foo, true)

but it returns NULL:

var_dump($data):
NULL

I use php5. The Content-Type of the response from the webservice: "text/html; charset=utf-8" (also tried to use "application/json; charset=utf-8")

What could be the reason?

Answers

EDIT: Just did some quick inspection of the string provided by the OP. The small "character" in front of the curly brace is a UTF-8 B(yte) O(rder) M(ark) 0xEF 0xBB 0xBF. I don't know why this byte sequence is displayed as ? here.

Essentially the system you aquire the data from sends it encoded in UTF-8 with a BOM preceding the data. You should remove the first three bytes from the string before you throw it into json_decode() (a substr($string, 3) will do).

string(62) "?{"action":"set","user":"123123123123","status":"OK"}"
            ^
            |
            This is the UTF-8 BOM

As Kuroki Kaze discovered, this character surely is the reason why json_decode fails. The string in its given form is not correctly a JSON formated structure (see RFC 4627)

Friday, September 9, 2022

pravi-d1c5750971b7

Try something like this:

//initialize array
$myArray = array();

//set up the nested associative arrays using literal array notation
$firstArray = array("id" => 1, "data" => 45);
$secondArray = array("id" => 3, "data" => 54);

//push items onto main array with bracket notation (this will result in numbered indexes)
$myArray[] = $firstArray;
$myArray[] = $secondArray;

//convert to json
$json = json_encode($myArray);

Friday, December 23, 2022

anoop_garlapati

Activity findViewById() searches the activity's view hierarchy set with setContentView() for the given view id. The view you appear to be looking for is in a fragment and not in the activity hierarchy (yet). Fragment transactions are not immediate either so even if you add it to the container in the activity hierarchy, it is not attached there right away but only when the transaction is processed.

In theory it's possible to synchronously execute pending fragment transactions with executePendingTransactions(). However, it's better to just move the code that touches a fragment's views in its onCreateView(). Fragments and their hosting activities are supposed to be relatively independent of each other, so an activity accessing a fragment's internals should be avoided.

Thursday, December 15, 2022

patko

So, here's some news. We looked into this and YES, this is a bug in .NET 4.

The good news is that it was fixed in .NET 4.5, so if you can, update your installation to .NET 4.5 and you're solid.

The other good news it that this fix has been back-ported to .NET 4 and will be available as a QFE (Quick Fix...a one off fix you'll apply) #578315. It was backported/fixed just days ago and it should be out ASAP. I'll try to get an exact date, but it's soon.

The other other good news is that there's a workaround for this on .NET 4 before the QFE. The workaround is weird, but it could unblock you.

using (ExecutionContext.SuppressFlow())     {
          // Create memory cache instance under disabled execution context flow
         return new YourCacheThing.GeneralMemoryCache(…);
}

Hope this helps.

UPDATE: The Hotfix is http://support.microsoft.com/kb/2828843 and you can request it here: https://support.microsoft.com/contactus/emailcontact.aspx?scid=sw;%5BLN%5D;1422

Saturday, November 12, 2022

rolfbly

you can use it like this, in JSON format when you evaluate false value it will give you blank, and when you evaluate true it will give you 1.

$str = '[{"clientId":"17295c59-4373-655a-1141-994aec1779dc","channel":"/meta/connect","connectionType":"long-polling","ext":{"fm.ack":false,"fm.sessionId":"22b0bdcf-4a35-62fc-3764-db4caeece44b"},"id":"5"}]';

$arr = json_decode($str,true);

if($arr[0]['ext']['fm.ack'])    // suggested by **mario**
{
    echo "true";    
}
else {
    echo "false";   
}

Thursday, October 6, 2022

matthias_benkard

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json_decode returns NULL after webservice call

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