Warning: Massive error in json_encode()

Question

Recieved in browser: [ \"1968401665333658496\"

Answer 1

It's not just a JSON issue. If you put

alert(1968401665333658496);

in firebug console you get 1968401665333658600

You're probably hitting the JS max value.

There's a discussion on that here : What is JavaScript's highest integer value that a Number can go to without losing precision?