[AroseKhanNiazi]

PHP код:

CMD:changepassword(playerid,params[])
{
    new size=strlen(params);
    if(size > 15 || size < 3) return SendClientMessage(playerid,-1,"Password should be between 3-15 characters.");
    new INI:File = INI_Open(UserPath(playerid));
    INI_SetTag(File,"data");
    INI_WriteInt(File,"Password",udb_hash(params));
    INI_Close(File);  
    SendClientMessage(playerid,-1,"Password changed");
    return 1;
} 


Remember this is a working example, but you must always check if the player is logged in before he uses this command.