Warning: Massive error in json_encode()

Question

Recieved in browser: [ \"1968401665333658496\"

Answer 1

Javascript has no concept of integers, according to the standard all numbers are IEEE doubles, which means they have 52 bits of mantissa. this leads to a practical maximum "integer" value of 2^53 before any loss of precision.

I am not sure how you didn't have problems with numbers this large in JS alone - if you didn't your JS implementation is not standards compliant.