src/Http/Cookie/Cookie.php
public static function isValidTimeStamp($timestamp)
    {
        return ((string) (integer) $timestamp === (string) $timestamp) && $timestamp <= PHP_INT_MAX && $timestamp >= ~PHP_INT_MAX;
    }
public static function isValidTimeStamp($timestamp)
    {
        return ((string) (integer) $timestamp === (string) $timestamp) && $timestamp <= PHP_INT_MAX && $timestamp >= ~PHP_INT_MAX;
    }
public static function isValidTimeStamp ( $ timestamp ) { return ( ( string ) ( integer ) $ timestamp === ( string ) $ timestamp ) && $ timestamp <= PHP_INT_MAX && $ timestamp >= ~ PHP_INT_MAX ; }
Checks if a timestamp is valid.

@param  integer|string $timestamp The timestamp to check.
@return boolean
Checks if a timestamp is valid .