php: number only hash?

by

An MD5 or SHA1 hash in PHP returns a hexadecimal number, so all you need to do is convert bases. PHP has a function that can do this for you:

$bignum = hexdec( md5("test") );

or

$bignum = hexdec( sha1("test") );

PHP Manual for hexdec

Since you want a limited size number, you could then use modular division to put it in a range you want.

$smallnum = $bignum % [put your upper bound here]

EDIT

As noted by Artefacto in the comments, using this approach will result in a number beyond the maximum size of an Integer in PHP, and the result after modular division will always be 0. However, taking a substring of the hash that contains the first 16 characters doesn’t have this problem. Revised version for calculating the initial large number:

$bignum = hexdec( substr(sha1("test"), 0, 15) );

More Related Contents:

  1. Divide md5 function with colon (:) [closed]
  2. encrypt and decrypt md5
  3. Increment number php every next number
  4. php , I want to build array from 12 values each value has max number of 2048
  5. Show a number to two decimal places
  6. php mysqli_connect: authentication method unknown to the client [caching_sha2_password]
  7. How to mathematically evaluate a string like “2-1” to produce “1”?
  8. Why is the hash part of the URL not available on the server side?
  9. Using PHP 5.5’s password_hash and password_verify function
  10. Is there an easy way to convert a number to a word in PHP?
  11. Secure random number generation in PHP
  12. Why is PHP printing my number in scientific notation, when I specified it as .000021?
  13. Display numbers with ordinal suffix in PHP
  14. Test if number is odd or even
  15. Converting words to numbers in PHP
  16. What type of hash does WordPress use?
  17. PHP short hash like URL-shortening websites
  18. Why does crypt/blowfish generate the same hash with two different salts?
  19. What are fragment URLs and why to use them?
  20. Round to max thousand, hundred etc in PHP
  21. Fastest hash for non-cryptographic uses?
  22. joomla password encryption
  23. PHP: Create an array for a range
  24. PHP prepend leading zero before single digit number, on-the-fly [duplicate]
  25. Max file number can php upload at same time
  26. php random x digit number
  27. PHP remove commas from numeric strings
  28. Check if http request comes from my android app
  29. Incrementing numbers starting from 0000 in php
  30. Convert number into xx.xx million format? [closed]

Leave a Comment