将唯一字符串与较短的唯一字符串匹配

Question

Let say I have to manage 1,000,000 phone numbers which are in 12-digit format. Certainly, they are distinguish. Now I want to assign to each number a shorter string (7 alphanumeric - case sensitive characters) that must be also distinguish. What would be the best solution using Php?

Answer 1

You can use PHP's base_convert() function to change integers into strings.

From integer to a-z0-9 base 36 string: $shortString = base_convert($phoneNumber, 10, 36);

From base 36 string to integer: $phoneNumber = base_convert($shortString, 36, 10);

If that's not short enough and you want to use the full gamut of a-zA-Z0-9 characters, you'll need to use a custom function to convert to base 62. There are some great ones at http://php.net/base_convert.