[PHP-DB] MD5 (' ')

[Ignat Ikryanov]

Hi!
I use md5 function to encrypt users password stored in MySql database. When I try 
encrypt string 'asdf' using md5 function I retrieve:
912ec803b2ce49e4a541068d495ab570
But in 'shodow' file of my linux (Debian 2.2 used MD5 to encrypt users password) 
'asdf' string looks like:
$1$arjq575D$rnHVFfcQE7.h2EgSU7yzQ1

Why results are different?