什么时候json_encode返回null

Question

I have an api where I return json. json_encode on arrays are returning null. In what cases does json_encode return null? Also what other values does json_encode return to indicate a failure

Answer 1

Returns a JSON encoded string on success or FALSE on failure.

DOCUMENTATION

json_encode() does not return null.

If some values in the json string are null, please check this: php json_encode returning null