PHP Encoding JSON Issue

I wanna json encode a PHP array to send it for a server, but the server wants it in this format:

[{ "key1": "value1", "key2": "value2", "key3": "value3" }]

But now my associative array after using json_encode() on it looks like this:

{ "key1": "value1", "key2": "value2", "key3": "value3"}

Answer

The first version with the [] is an array of objects, you just have a single object. Just create an array with that single object…

echo json_encode( [ $data ] );

gives…

[{"key1":"value1","key2":"value2","key3":"value3"}]