Encryption

Hello guys, I'm learning PHP, because I want to create an UCP for my SA-MP server. I'm encrypting my password in PHP with "md5" function, but It is encrypting it only for the PHP, how can I encrypt it in my server, like when I register in the game the password will be "123456789" encrypted to "desahgf54g45ds6g4dg8tdfhg64ds", but PHP can read it?
I hope you understand me, thank you!!!
+1 REP to HELPERS :)