PHP-and-MySQL/C4/User-Password-Change-Part-2/English

Time	Narration
0:00	Welcome to the 2nd part of our “Change Password” tutorial. In the last one, we learnt how to check if our forms were submitted.
0:09	We’ve got our data values in here.
0:13	Please remember that inside our database, our passwords are encrypted.
0:18	So, as soon as these fields are coming in, I will encrypt them into an md 5 hash.
0:27	Make sure you put the brackets.
0:35	What I have highlighted here is our parameter.
0:38	So, here we will have our md5 encrypted passwords.
0:43	We will need to check this field to see whether they exist or not.
0:51	At the moment when we submit our form, we see that nothing really happens.
0:57	First I will say “check password against db” and then we have to connect to our database.
1:08	We have already connected to the database in several of these pages- like the Login page.
1:15	You can put this into a separate file, say, “include” and” include connect .php” with your one time login script in, so that you don’t have to keep typing it.
1:29	But for our tutorial's sake, I will keep typing it over and over again because this is a good way to learn.
1:35	We type here - "connect = mysql_connect".
1:40	And we will be connecting to our local host database, with my username as root and my password as nothing, I am going to select my database.
1:50	So that is “phplogin” which here. Lets go there and you can see it here.
1:58	Our table is "users", which we can use later on.
2:01	Next we will create a query to get the passwords.
2:05	So I will type “ query get” which is equal to mysql.......... "mysql query" and here we will type "SELECT password" - We need to ascertain the password from the database "users".
2:26	You can see here. This is the "users" table.
2:31	Then we type “Where username is equal to user”. This is our session variable holding our user’s user name.
2:39	So, what we are doing is we are selecting our password hash from this table where the username is equal to the session name, and that is equal to “Alex”.
2:49	So, that should be a successful query. And you can type at the end “ or die "Query didn’t work”" - some error message.
2:59	You can be a bit imaginative with these error messages and type what you like.
3:08	Same here. You can say “or die”. You can add your own error message in here but to save time, I am not going to right now.
3:17	Now, we will use this slightly differently, before we use the "while" function to loop through every record in the data base.
3:25	I was informed about this method through a comment someone posted. I will say "row = mysql_fetch_associative". And that‘s "query get"
3:41	We will set “old password db” which is a new variable name . Don’t mistake this with the old password that has been submitted.
3:50	Our old password inside the database will be equal to our row.
3:55	Remember this creates an array.
3:58	So this value is” password”, because inside our database, this is “password” here. You need to use the labels.
4:06	So from here on we can check our passwords.
4:08	Checking our old passwords and our new passwords is just a simple “IF” statement.
4:16	Lets type - if the old password is equal to the old password inside the database.
4:25	These are both md5 hashes because we converted them into an md5 hash earlier.
4:30	So, if they are equal then we’ll run a block of code, otherwise we’ll kill the page and say ” Old password doesn’t match!”.
4:44	So here, assuming we’ve got through the first stage of our validation,- we checked the old password with to old password in the database - now we need to our two new passwords.
4:57	Now this is just as simple as typing “if new password is equal to repeat new password”, then we can write a block of code, otherwise we can just kill the page and say “ New passwords don’t match!”.
5:20	So here this is “success” and then we’ll say “change password in database”.
5:31	So now what I’ll do is echo out “success” and I’ll go back to my page.
5:38	I’ll type my password wrong on purpose. So I’ll just type this.
5:41	My new password I’ll type as "abc" and then clicking on “change password” we get the message "Old password doesn’t match!".
5:49	If I type "abc" as my old password, which it is, and "123" as my new password and random letters in the next, we should get.....Oh "Old password doesn’t match!"
6:00	Lets go back and check the code. Old password......... row - password............ query get........
6:13	What we can do here to debug is just say “echo old password db” with a break on the end, and just say echo old password with another break.
6:31	What we can do now is, run the script again, so old password equals "abc", new password equals "123" and then random letters.
6:44	okay so let’s compare these. They both look the same to me, so we can see that we’ve got a problem here.
6:50	Again lets check the code. Checking for the spellings.
7:15	Ok I just found out the problem. If I go back to my database here, we see that I had added in this value myself and I had created this space at the end of this - you can see it highlighted in blue - I’ll just get rid of that quickly and I’ll come back to my page.
7:33	I’ll login again as usual and quickly change my password, I’ll put my old password in correctly and random text for my two new passwords.
7:45	You can see that my two new passwords don’t match.
7:49	We've echoed this out already, so now we can delete this.
7:53	So assuming my passwords do match, let me echo this success message.
7:58	So let’s just delete these. I put them for debugging.
8:02	I’ll just type in my old password, my new passwords 123 and 123, click change password, and we’ve got success.
8:10	So I apologise for that last slip-up there.
8:18	So in the 3rd part of this tutorial, we will continue with updating the user's password and just making sure everything’s working properly.
8:29	Thanks for watching. This is Joshwa Mathew dubbing for the Spoken Tutorial Project.

Contributors and Content Editors

Chandrika, Pravin1389