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We have an array,

 $a = array('a'=>NULL);

If we convert it to json with json_encode, it will return 

 echo json_encode($a, JSON_PRETTY_PRINT);
 {
     "a": null,
 }

The value of key a is null which would fail [NSDictionary writeToFile:atomically:] in Mac. Our best option till now is using array_map with trim:

 echo json_encode(array_map(trim, $a), JSON_PRETTY_PRINT));
 {
     "a": "",
 }

However, we need to update all json_encode and it looks clumpy. Is there any other option? We don't want to create a function for this simple purpose nor use override_function in adp

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json_encode does the right thing here. If some other function elsewhere cannot handle null, either fix/preprocess data for that function or do not give it null values. – deceze Jan 24 at 10:46
Why don't you just array_walk() your array with function checks is value is NULL and turn it into ""? – s.webbandit Jan 24 at 10:47
You can make the changes in your php scripts and all other possible/future json sources ...or fix it on the other side where you try to presist the NSDictionary, see stackoverflow.com/questions/8075147/… – VolkerK Jan 24 at 11:11
1  
maybe you should rather consider using something else than [NSDictionary writeToFile:..] as it is pretty limited to objects supported by plist (for example you could use NSJSONSerialization to read/write to file, or some open source JSON kit if app target is lower than OSX10.7/iOS5.0) – lupatus Jan 24 at 11:12
1  
@s.webbandit array_map(trim, $a) can do the same, and it helps me to trim the array too. – neo.orz.hk Jan 24 at 14:12
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