Online PHP editor | refs for pr2iD

@ 2016-06-02T10:17:56Z

<?php

function isValidTimeStamp($timestamp)
{
    return ((string) (int) $timestamp === $timestamp) 
        && ($timestamp <= PHP_INT_MAX)
        && ($timestamp >= ~PHP_INT_MAX);
}

var_dump(isValidTimestamp("114004965600"));