JSON parsing issues from PHP service

Question

I'm using json_encode on a two dimensional array in a PHP script like so:

$myjsons[] = json_encode(array($runners));

And also MANY single dimensional arrays later in the script:

$myjsons[] = json_encode(array($mrow));

I then echo after encoding the entire array at the end of the script:

echo json_encode($myjsons);

I'm working on an iOS app that communications with this service. Well, at least it is suppose to. Here is the iOS code minus error checking: (I'm using JSONKit, btw)

NSMutableURLRequest *urlReq = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:kStartRaceURL]];
[urlReq setHTTPMethod:@"GET"];

NSError *requestError;
NSURLResponse *urlResponse = nil;

NSData *response = [NSURLConnection sendSynchronousRequest:urlReq returningResponse:&urlResponse error:&requestError];

NSArray *deserializedData = [response objectFromJSONData];

The deserializedData is an array, but all objects within it are strings. I put arrays in it though, as shown in the PHP, so why are they NSString's? Where is the problem with the implementation? Or should I do something with the NSString's?

Tushar · Accepted Answer · 2013-03-31 05:16:22Z

3

json_encode returns a string, so when you put those in an array, you get an array of strings. When you json_encode that array, you get a (JSON) string array of strings.

To fix this, you should first merge all your arrays into one large array, and then only call json_encode once on that final array. Example:

$myjsons[] = array($runners);
$myjsons[] = array($mrow);

echo json_encode($myjsons); // Correct JSON as you expect it.

answered Mar 31, 2013 at 5:16

Tushar

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1 Comment

Jordan Over a year ago

Honestly, I was thinking that was the problem, though PHP is by no means my language of choice. Thank you!

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