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  Name:     shl() - bitwise shift left of a number
  Usage:    shl(<int>,<number>)
  Params:   integer <int> - number to shift, not greater then 65535
            integer <number> number of shifts, not greater than 255
  Returns:  integer equal to the bitwise shl of <int> and <number>

 ---------------------------------- Example ---------------------------------

                 ? shl(8,1)          && prints 16
                 ? shl(8,2)          && prints 32
                 ? shl(15,3)         && prints 30
                 ? shl(245,8)        && prints 0

  Note:     Shl()'ing one value with another will shift the bits
            in <int> to the left the number of times specified
            by <number>. If bit 7 is 1, then that bit drops off
            the end. eg:

                 parameter = binary       = dec
                 v1        = 10000110     = 134
                 v2        = 00000010     = 2
                 shl(v1,v2)= 00011000     = 24

            You can use num2bin() and bin2num() to convert
            binary strings into their decimal equivalents for ease
            when using the binary functions.