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Build forms PHP in MySQL

Building forms provides you with in-depth training on Developer. Taught by Kevin Skoglund as part of… Show More

PHP with MySQL Essential Training

with Kevin Skoglund

Video: Build forms PHP in MySQL

Building forms provides you with in-depth training on Developer. Taught by Kevin Skoglund as part of the PHP with MySQL Essential Training
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  1. 4m 8s
    1. Welcome
      1m 0s
    2. Using the exercise files
      3m 8s
  2. 15m 6s
    1. What is PHP?
      3m 52s
    2. The history of PHP
      2m 51s
    3. Why choose PHP?
      4m 10s
    4. Installation overview
      4m 13s
  3. 1h 3m
    1. Overview
      2m 33s
    2. Working with Apache Web Server
      6m 56s
    3. Changing the document root
      7m 24s
    4. Installing to Yosemite
      8m 13s
    5. Enabling PHP
      6m 16s
    6. Upgrading PHP
      3m 30s
    7. Configuring PHP
      10m 3s
    8. Installing MySQL
      5m 46s
    9. Configuring MySQL
      7m 24s
    10. Text editor
      5m 1s
  4. 31m 25s
    1. Overview
      3m 27s
    2. Installing WampServer
      5m 46s
    3. Finding the document root
      2m 24s
    4. Configuring PHP
      8m 12s
    5. Configuring MySQL
      5m 45s
    6. Text editor
      5m 51s
  5. 19m 12s
    1. Embedding PHP code on a page
      6m 43s
    2. Outputting dynamic text
      5m 55s
    3. The operational trail
      2m 27s
    4. Inserting code comments
      4m 7s
  6. 1h 18m
    1. Variables
      7m 50s
    2. Strings
      4m 38s
    3. String functions
      8m 54s
    4. Numbers part one: Integers
      6m 27s
    5. Numbers part two: Floating points
      5m 25s
    6. Arrays
      10m 0s
    7. Associative arrays
      6m 37s
    8. Array functions
      6m 33s
    9. Booleans
      3m 50s
    10. NULL and empty
      5m 15s
    11. Type juggling and casting
      8m 27s
    12. Constants
      4m 43s
  7. 27m 37s
    1. If statements
      6m 0s
    2. Else and elseif statements
      4m 16s
    3. Logical operators
      7m 30s
    4. Switch statements
      9m 51s
  8. 42m 15s
    1. While loops
      8m 41s
    2. For loops
      5m 59s
    3. Foreach loops
      8m 16s
    4. Continue
      8m 28s
    5. Break
      4m 8s
    6. Understanding array pointers
      6m 43s
  9. 37m 25s
    1. Defining functions
      8m 25s
    2. Function arguments
      5m 32s
    3. Returning values from a function
      7m 33s
    4. Multiple return values
      4m 53s
    5. Scope and global variables
      6m 2s
    6. Setting default argument values
      5m 0s
  10. 20m 18s
    1. Common problems
      3m 47s
    2. Warnings and errors
      8m 36s
    3. Debugging and troubleshooting
      7m 55s
  11. 57m 57s
    1. Links and URLs
      5m 33s
    2. Using GET values
      5m 35s
    3. Encoding GET values
      8m 41s
    4. Encoding for HTML
      9m 26s
    5. Including and requiring files
      7m 40s
    6. Modifying headers
      6m 45s
    7. Page redirection
      6m 43s
    8. Output buffering
      7m 34s
  12. 1h 3m
    1. Building forms
      7m 28s
    2. Detecting form submissions
      5m 59s
    3. Single-page form processing
      7m 57s
    4. Validating form values
      10m 40s
    5. Problems with validation logic
      9m 54s
    6. Displaying validation errors
      7m 23s
    7. Custom validation functions
      6m 28s
    8. Single-page form with validations
      7m 25s
  13. 28m 5s
    1. Working with cookies
      2m 49s
    2. Setting cookie values
      5m 55s
    3. Reading cookie values
      6m 1s
    4. Unsetting cookie values
      4m 51s
    5. Working with sessions
      8m 29s
  14. 48m 39s
    1. MySQL introduction
      6m 43s
    2. Creating a database
      7m 41s
    3. Creating a database table
      7m 42s
    4. CRUD in MySQL
      5m 48s
    5. Populating a MySQL database
      7m 32s
    6. Relational database tables
      6m 40s
    7. Populating the relational table
      6m 33s
  15. 56m 4s
    1. Database APIs in PHP
      4m 51s
    2. Connecting to MySQL with PHP
      7m 45s
    3. Retrieving data from MySQL
      8m 47s
    4. Working with retrieved data
      6m 12s
    5. Creating records with PHP
      6m 58s
    6. Updating and deleting records with PHP
      9m 6s
    7. SQL injection
      3m 5s
    8. Escaping strings for MySQL
      6m 45s
    9. Introducing prepared statements
      2m 35s
  16. 35m 58s
    1. Blueprinting the application
      7m 19s
    2. Building the CMS database
      5m 14s
    3. Establishing your work area
      4m 38s
    4. Creating and styling the first page
      4m 22s
    5. Making page assets reusable
      6m 36s
    6. Connecting the application to the database
      7m 49s
  17. 32m 49s
    1. Adding pages to the navigation subjects
      5m 58s
    2. Refactoring the navigation
      6m 7s
    3. Selecting pages from the navigation
      6m 2s
    4. Highlighting the current page
      5m 26s
    5. Moving the navigation to a function
      9m 16s
  18. 1h 45m
    1. Finding a subject in the database
      9m 48s
    2. Refactoring the page selection
      10m 52s
    3. Creating a new subject form
      6m 55s
    4. Processing form values and adding subjects
      11m 20s
    5. Passing data in the session
      9m 16s
    6. Validating form values
      9m 40s
    7. Creating an edit subject form
      8m 30s
    8. Using single-page submission
      7m 44s
    9. Deleting a subject
      9m 44s
    10. Cleaning up
      10m 37s
    11. Assignment: Pages CRUD
      4m 30s
    12. Assignment results: Pages CRUD
      6m 10s
  19. 39m 26s
    1. The public appearance
      8m 52s
    2. Using a context for conditional code
      11m 37s
    3. Adding a default subject behavior
      6m 9s
    4. The public content area
      5m 51s
    5. Protecting page visibility
      6m 57s
  20. 1h 3m
    1. User authentication overview
      4m 3s
    2. Admin CRUD
      8m 41s
    3. Encrypting passwords
      7m 26s
    4. Salting passwords
      5m 42s
    5. Adding password encryption to CMS
      11m 54s
    6. New PHP password functions
      3m 13s
    7. Creating a login system
      11m 28s
    8. Checking for authorization
      5m 48s
    9. Creating a logout page
      5m 40s
  21. 2m 4s
    1. Next steps
      2m 4s

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Building forms
Video Duration: 7m 28s 14h 24m Beginner Updated May 20, 2015


Building forms provides you with in-depth training on Developer. Taught by Kevin Skoglund as part of the PHP with MySQL Essential Training

View Course Description

PHP is a popular, reliable programming language at the foundation of many smart, data-driven websites. This comprehensive course from Kevin Skoglund helps developers learn the basics of PHP (including variables, logical expressions, loops, and functions), understand how to connect PHP to a MySQL database, and gain experience developing a complete web application with site navigation, form validation, and a password-protected admin area. Kevin also covers the basic CRUD routines for updating a database, debugging techniques, and usable user interfaces. Along the way, he provides practical advice, offers examples of best practices, and demonstrates refactoring techniques to improve existing code.

Topics include:
  • What is PHP?
  • Installing and configuring PHP and MySQL
  • Exploring data types
  • Controlling code with logical expressions and loops
  • Using PHP's built-in functions
  • Writing custom functions
  • Building dynamic webpages
  • Working with forms and form data
  • Using cookies and sessions to store data
  • Connecting to MySQL with PHP
  • Creating and editing database records
  • Building a content management system
  • Adding user authentication

Building forms

Now that we know how to build web pages to use dynamic data. In this chapter we're ready to look at how to build pages that has forms for submitting form data. this represents the second way that we can get data back from a user. They can either click a link, or type a URL, which is basically the same thing. Or they can submit a web form to us. You remember that URL and links are GET requests, and submitting a form is going to be a POST request. With GET request we saw that PHP automatically took all of the query parameters and put them into an associated array assigned to the super global GET. Well guess what, PHP is going to do the exact same thing for us with POST request by using the super global POST.

That's the dollar dign, underscore followed by capitals POST. All the values posted in the form data will be in that associative array, ready for us to access, just like we did with the links. So, if a form has a first name input field, then we'll be able to ask the POST superglobal for the key that matches the input field name. When we submit forms, there's generally going to be two pages, one page which has the web form on it, ready to be filled out. And then, a second page that does the processing of the form. Let's try creating those two pages. So to begin with, let's make our form page, and I'm going to just use basic HTML as a template.

I'll do Save As, and I'm going to call this form.php. Form, and then I'm just going to paste in some HTML here, so you can pause the movie if you need to copy that out, but it's just basic HTML form. So I've got my form with its action, which is form processing.php. That's the page that doesn't exist yet, but it's where we're going to send this data, so this is going to post the data to form processing.php. And the method that it will use is post, and that's common, and we're going to do that with almost all forms, send them as post data.

And then we've got our user name, where I'm going to have an input field. It's going to be a text field, and the name of that is going to be username. Now, this is important because this is the key in the associative array on the processing page that I'm going to look for. So inside post, there'll be a value for username, and it'll be exactly the name that's here. Now, there is no value for it, it's just going to be a blank field. Then on the next line, I've got password. Everything's the same, except that it's of type password, which just means that it doesn't show the text as I've typed it. It puts bullets instead. And then last of all, I've got a submit button down here, that's what this is. And it's going to have the text submit on it, the type is submit. I've also got a name attribute for submit.

We'll talk about in a couple movies why we want to have that. For now, just go ahead and make sure that yours has it too. And then we close the form tag. So that's it, it's just basic HTML. Let's save it and just bring it up in a browser. So for me that's going to be localhost and then kevinskoglund/sandbox/form.php, so there it is. It's not the prettiest form in the world but it gets the job done. So we would type in a name here, username, and then you type in your password, you can see that it puts bullets there instead of showing you the text. And then I click Submit, and there is it. It submitted it to form_processing.php a page that doesn't exist yet because I haven't created it.

But you can see it did switch the URL to be that and in the process of doing that it sent along all those attributes as post parameters. They don't show up here, they're not up in the URL, but they were sent. They were packaged up in the browser and sent along with the request to the web server. So let's take a look at how we can view those. Let's just set this aside, and I'm going to go back to Sites and open up basic.html again. This time, though, I'm going to Save a copy as form_processing.php. I don't really have to have the HTML here.

I could just have a strictly PHP page, but I'm going to go ahead and be displaying some output. So I'm going to leave the HTML. So now if I were to reload the page, the page does exist, but I would get nothing. It would do nothing there. Let's take a look at those values to start with. So inside pre tags, let's do our php tags. And our closing pre tags, so I don't forget. And inside there, we're going to use print_r and take a look at that POST super global, which is an associative array. So let's go back over here, let's go back to this page.

I'll put in another password again and then hit Submit, there we go. You see what came through? Here's an associative array. Username, there's the key, there's the value. There's the key, there's the value and then submit. It went ahead and just gave me that value as well. Now let's just try loading that page on it's own again, just from the URL string. Let's just hit Reload up here. It actually says do you want to reload it with the post data, let's skip that, we don't want to do that. What I want to show you is, let's just hit Return from the URL bar, so it's actually making a get request to form processing.php, do you see that? It's not a post request, it's a get request, because it's coming from the URL, and now my array is empty. We have to come from this page so it's a post request and so that the data is in fact posted with the post request.

See how that works? So now we're able to go back to that page and see those values let's actually just output some values. Let's do br tag here and we'll open up php again. And let's get the values, let's say username equals, well how do we do that? POST, and then the key that we want, username, there you go. We'll do the same thing, I'll just Copy and Paste it, and password, password. So now I've set variables equal to that value. So now I'm ready to work with them, it's a little more convenient I think to work with these variable then it is to always have to type out the super global version.

Plus later we're going to do some checking and some conversion on some of this stuff. So we're probably going to do that when we're bringing it into our variable making it a good safe value. And the let's, let's do echo, so echo and lets do dollar sign username and password. Now obviously you would not be doing this kind of echoing in the real world. We're just doing it for testing purposes. Probably you would want to do something else with these values like store them in the database, use them to look up data. Or in this case to use them to actually log this user in. But for now we're just going to show that we've successfully pulled those values in, assigned to variables, and now we can work with them.

So let's go back, let's have our form, and let's Submit, and there we go. There's my username, my password, and then down here you can see that I've got kevinskoglund and secret. Now unlike GEt request, POST data does not need to be encoded or decoded. So all that stuff that we worried about before with the query string, you aren't going to need to worry about with post data. That post data is packaged up separately, so that it doesn't interfere with what's going on in the query string at all. So the only time you'll need to worry about that is here for the action. Because that is going to be in the query string if you were doing some dynamic processing there.

Then you would need to do those normal things that we saw for working with get requests. But the data itself, what's inside here inside the form, does not need any kind of encoding whatsoever. So the very last thing is, let's just come back over here now and let's reload this page again, just like we just did before and let's hit Return. But this time I'm not just casually showing the output of the array. I'm actually trying to assign some values. And I did that by asking for an actual key, user name. And it says oops, notice that key doesn't exist.

So I'm getting a notice now when I try and do this because that form value wasn't sent. In the next movie let's talk about how you detect form submission to know whether you can expect that value to be there or not.

Find answers to the most frequently asked questions about PHP with MySQL Essential Training .

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Q: This course was revised on 6/4/2013. What changed?
A: The old version of this course was 6 years old and it was time for a complete revision, using PHP 5.4. (The tutorials will work with any version of PHP and covers any differences you might encounter). The author has also added updated installation instructions for Mac OS X Mountain Lion and Windows 8. The topics and end project are the same, but the code is slightly different. It also addresses frequently asked questions from the previous version.
Q: This course was updated on 5/20/2015. What changed?
A: We added one movie called "Changing the document root in Yosemite," which helps the Mac installation run more smoothly.





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