When running on 32 bit versions of PHP, intval does not correctly convert micros for start and end time.

[BackTrak]

Because the library does not check the return result from the LightStep report API, it does not give any indication that LightStep is rejecting messages from 32 bit PHP with a "can't decode value" error due to the timestamps for the micros values being negative numbers because 32 bit PHP cannot correctly convert the long micros values using only 4 bytes. It would be nice if the module would throw an exception at initialization if it is not being used on a 64 bit platform to give users a clue on why their tracing is not arriving at the server. Detecting 64 bit-ness is easily done with this check:

function is64bitPHP() {
    return PHP_INT_SIZE == 8;
}