Fastest way to check if a string is JSON in PHP?

Question

I need a really, really fast method of checking if a string is JSON or not. I feel like this is not the best way: function isJson($string) { return ((is_string($string) && (is_object(json_decode($string)) || is_array(json_decode($string))))) ? true : false; } Any performance enthusiasts out there want to improve this method?

Answer 1

A faster way to do this would be to simple let PHP do a json_decode, and simple check if there was a JSON error, then return the value of that check. Try this.

function isJson($string) {

json_decode($string);

return (json_last_error() == JSON_ERROR_NONE);

}