PHP Warning: json_encode() [function.json-encode]: Invalid UTF-8 sequence in argument in

PHP Warning: json_encode() [function.json-encode]: Invalid UTF-8 sequence in argument in The problem we are seeing is that the value being encoded to json is not UTF-8 encoded data. PHP function json_encode, unfortunately, will only accept UTF-8 as its parameter. If you search online, you will find that most people solve this problem by using the PHP function utf8_encode. This is fine and dandy if the data you deal with only contains regular alphanumerical characters (letters and numbers), but what if it contains characters from foreign languages? utf8_encode will most certainly return unwanted values, and this is not what you want. Using utf8_encode is the right idea, but you don’t want to call the function on all your values, just the ones that require it. better to use utf8_encode($value); in the latest php version the warning will not come.