How would you convert an integer to base 62 (like hexadecimal, but with these digits: 0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ)?

2011年2月11日 · I have a number in base 10. Is there anyway to translate it to a base 62? Example: echo convert(12324324); // returns Yg3 (fantasy example here) PHP's base_convert() can convert up to base 36.

The routines take care of switching between base 10 and base x automatically and the value you set is preserved in the base you set it in, so no accuracy is lost (until conversion that is, but even then precision loss should be very minimal since this routine uses Double and Long where ever possible). I can't command on the speed of this routine.

2018年11月30日 · Can't decode a base 64 string with Convert.FromBase64String() 3 Is it possible to convert an integer ( short, int, long ) into a base 64 string ( and vice-versa )?

2015年5月27日 · Before knowing about base-x I went ahead and created a module for the base62 encoding and another for the base62 UUID generation: uuid-base62: var uuidB62 = uuidBase62.v4(); // -> 2qY9COoAhfMrsH7mCyh86T This is the no frills solution. Currently it's not as fast as A since b62 is much slower but I intend to replace it with base-x.

2010年10月24日 · Let's see. 128/log2(62)=21.497. That means you'd need 22 "digits" for a base-62 representation. If you're just interested in a string representation that's not longer than 22 characters and doesn't use more than 62 different characters, you don't need a real base-62 representation. You can break up 128 bits into smaller pieces and code the ...

2019年10月21日 · Base 64 encoding is dead simple: Take 6 bits, map them onto a character, repeat until done. This is so simple, because 64 is a power of 2. With base 62 however, you will have to convert to an integer and start carrying over the "remainder" with each step, because the patterns do not fit evenly.

2017年3月8日 · There are two common encodings for base-64: [a-zA-Z0-9/+] and [a-zA-Z0-9_-]. If you go with the latter, then that resolves your selection issue. On the other hand, I think base-62 is more widely used than I originally thought.

2021年11月3日 · You have a binary code, you convert to a number, you convert the number into a (e.g.) 62 base, then you choose 62 symbols to display the digits of such 62 number. So the length depends just on initial string (base62 is not an hashing algorithm).

bc<<<"obase=62;$1" converts to a sequence of space prefixed decimal numbers from 00 to 61 then offset each digit into ASCII table and convert to character with awk's printf Or without the for loop: