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  Name:     ltrimlen() - get length of string as if ltrimmed()
  Usage:    <integer> = ltrimlen(<string>)
  Params:   string <string> - the string to check
  Returns:  integer equal to the length of the string without leading
            spaces.

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

                 ? len(ltrim("   this is the string    "))
                 * prints 22
                 ? ltrimlen("   this is the string    ")
                 * prints 22

  Note:     This function is slightly faster than len(ltrim(memvar)).