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Bug #67451 MD5 and national characters
Submitted: 2014-06-16 09:03 UTC Modified: 2014-06-16 10:04 UTC
From: frenky dot pv at atlas dot cz Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 5.5.13 OS: Win2012, 64bit
Private report: No CVE-ID: None
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 [2014-06-16 09:03 UTC] frenky dot pv at atlas dot cz 
Description:
------------
PHP:
  md5('házená') = 3d560aed38ceab4eb6892b7aa377d39a  (wrong)

MySQL:
  SELECT MD5('házená') = 6270f1b53a892b56531f91e66d5d7139  (correct)

'házená' is the Czech word translation into English 'handball'.

Have something similar was written:
http://cz1.php.net/manual/en/function.md5.php#31238

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 [2014-06-16 10:04 UTC] johannes@php.net
-Status: Open +Status: Not a bug
 [2014-06-16 10:04 UTC] johannes@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

PHP knows little about encodings the md5() function works on the binary string array which uses whatever encoding you are using to save your file. From a quick test it seems your database uses UTF-8 while your code uses Latin 1 (ISO-8859-1)

$ cat t.php 
<?php
echo md5('házená');

$ php t.php
6270f1b53a892b56531f91e66d5d7139

$ iconv -f utf-8 -t iso-8859-1 t.php | php
3d560aed38ceab4eb6892b7aa377d39a
 
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