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PHP with MySQL Essential Training

The public content area


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PHP with MySQL Essential Training

with Kevin Skoglund

Video: The public content area

The public side of our content management system is really coming along. In this movie, I want us to take a look at the right side of the content, that is, where the paragraphs of text, the main content of the website is going to exist. And see if we can make some improvements there. Currently if we go to index.php with no page or subject selected, we get, please select a subject or page. Not particularly user friendly. And then if I click on any one of these pages, the content here doesn't look that great. So let's see if we can make some improvements. I'll go to index.php and instead of please select a subject or page this is the default text. So this could be anything we wanted.
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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. 54m 53s
    1. Overview
      2m 33s
    2. Working with Apache Web Server
      6m 56s
    3. Changing the document root
      7m 24s
    4. Enabling PHP
      6m 16s
    5. Upgrading PHP
      3m 30s
    6. Configuring PHP
      10m 3s
    7. Installing MySQL
      5m 46s
    8. Configuring MySQL
      7m 24s
    9. 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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PHP with MySQL Essential Training
14h 24m Beginner Jun 04, 2013

Viewers: in countries Watching now:

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
Subjects:
Developer Servers Programming Languages Web Development
Software:
MySQL PHP
Author:
Kevin Skoglund

The public content area

The public side of our content management system is really coming along. In this movie, I want us to take a look at the right side of the content, that is, where the paragraphs of text, the main content of the website is going to exist. And see if we can make some improvements there. Currently if we go to index.php with no page or subject selected, we get, please select a subject or page. Not particularly user friendly. And then if I click on any one of these pages, the content here doesn't look that great. So let's see if we can make some improvements. I'll go to index.php and instead of please select a subject or page this is the default text. So this could be anything we wanted.

When you first come to the website this is what you see. It's essentially the home page. So we could put anything we want there, I'm just going to put a placeholder to say welcome. This could be an image or a slideshow or several paragraphs of text welcoming people to the site but that's what's going to go here. Now when we actually display the content that's what takes place in this block. If we have a current page then show the current page. Instead of just showing the content, lets also just put the top inside h2 tags, I'm going to put the menu name again. Let's see what that looks like.

So we come over here, index.php, welcome. And then about, now we get our mission and it says our mission over here. Our history and it shows our history. I think that that's a little nicer. Now let's come back over here and I want you to look at the content itself. Now at the moment we're calling HTML entities on it. But we don't have to. Let's talk about a couple of the options that we have there. You remember when we talked about escaping for HTML that we have this functions called htmlspecialchars and it's what renders the content safe for display in the HTML. You definitely need to call this method if you want to make sure that the content is not going to break your HTML.

However, it is optional. If you wanted to have HTML, if you wanted to allow HTML to be in that content block then you couldn't call this, right? This is making sure that there is no HTML in there. It renders it harmless. But if we wanted HTML, then it would be up to our admins to make sure that it wasn't going to break the site. PHP wouldn't be taking care of it for us anymore. It would now be a manual process. There's some risks involved with that but we could do that. We also have HTML entities.

And that's what we're using right now. It does everything that htmlspecialchars does but it goes one step further. And it also encodes things like accident characters, currency symbols, anything that can be turned into an html entity will be. But it offers the same safety features that htmlspecialchars does. Another possibility is not to just render them harmless but to remove them altogether. And we have strip tags, is a function in php that will go through looking for html tags and it'll just remove them. It doesn't render them harmless, they don't suddenly still show up in the text, whereas htmlspecialchars will take something like a div tag and it will then display the div tag.

Strip tags will just remove it, you won't see it at all. Another extremely useful function is nl2br. Right now, let's imagine that we don't allow html in our content area. If a user is typing in there, they might hit line return and expect those line returns to stay when we actually display the content. However, HTML doesn't care about line returns. It's white space independent. In order to have a line return in HTML, you need a BR tag. Well that's where this function comes in.

Nl2br converts new lines, that's the nl into br tags. So it converts new lines into br tags so that they're preserved, the way that the user might expect. Let's use that one so you can see how it works. So here where I'm displaying the content, what I want to do is put nl2br. And I want to do it outside of html entities. And think about why that is, html entities takes anything that was html and renders it harmless basically makes it stop being html.

And what we're doing here is generating HTML, so we don't want to generate the HTML and then have it rendered impotent immediately afterwards. Instead we want to render anything impotent that's in the content and then take the new lines and only have br tags. That's the only thing we're going to end up with out of it that's valid HTML. So let's save that. We don't have anything yet that has new line returns, at least I don't. So let's go to our history. Let's edit. Founded in 1898 by two interprising engineers.

Line return. Line return. And then I'll say more recently dot dot dot edit page. Now notice here, you can see what happens when we don't have an L2br. Right. It doesn't preserve the line returns because HTML doesn't care about it. I click edit page. You'll see that they're still there. They exist in the data, but HTML is not respecting them. We come over to the public side, so here I am on the public side of things again about Widget corp, our history, you'll see that nl2br now does preserve them. If I view source on that you can actually take a look and see here's the br tags, alright.

So all those new lines got turned into br tags, and that's often the behavior that users expect. When they're given a text area like that. They expect those line returns to be preserved in the HTML. At this point, we're almost done with the public side of our CMS. There's one last thing that I want us to consider and that is the visibility of the pages that we allow people to see over here. Right now we have visibility accounted for in our navigation. But we aren't checking to make sure that things are visible here on the content side before we actually display them.

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.
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