phpman > perldoc > int(12We)

    int EXPR
    int     Returns the integer portion of EXPR. If EXPR is omitted, uses
            $_. You should not use this function for rounding: one because
            it truncates towards 0, and two because machine representations
            of floating-point numbers can sometimes produce counterintuitive
            results. For example, "int(-6.725/0.025)" produces -268 rather
            than the correct -269; that's because it's really more like
            -268.99999999999994315658 instead. Usually, the "sprintf",
            "printf", or the "POSIX::floor" and "POSIX::ceil" functions will
            serve you better than will "int".