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Protecting page access with PHP server behaviors

From: Dreamweaver with PHP and MySQL

Video: Protecting page access with PHP server behaviors

Once you've created a login form for your web site, you can then protect individual pages so that only users who have logged in can view them. For this demonstration, I'll use the file explorerlist.php in the explorers folder, under the chapter 8 site root. With the file open on the screen, I'll go to the menu and choose Insert > Data Objects > User Authentication. From there, I'll choose Restrict Access To Page. On this screen, I am asked to check whether a user has already logged in.

Protecting page access with PHP server behaviors

Once you've created a login form for your web site, you can then protect individual pages so that only users who have logged in can view them. For this demonstration, I'll use the file explorerlist.php in the explorers folder, under the chapter 8 site root. With the file open on the screen, I'll go to the menu and choose Insert > Data Objects > User Authentication. From there, I'll choose Restrict Access To Page. On this screen, I am asked to check whether a user has already logged in.

You can either choose to protect based on a username and password or a username, password, and access level. I'll use the default setting, and that means that anybody who is logged in will be able to view the page. Then for users who haven't logged in, I'll indicate which page I want them to see. I'll browse, make sure I'm at the site root, go to the login folder, and choose my login form, login.php, and then I'll click OK. I'll save my changes, and I'll run the page in the browser.

And now, instead of going to the page I requested, I am sent to the Log In form. If you're working on Mac and you're having trouble previewing the file, go back to the first video in this chapter and make sure you followed the instructions for updating your database connection. It might be that you're having trouble connecting to the database. Let's take a look at the code that was generated. I'll go back to the page in Dreamweaver and look at Code View. Up at the top of the page, there is a bunch of new PHP code. Here are some of the critical pieces.

This conditional code block checks to make sure that a session has been started. The nature of a session is that it tracks a particular user, as long as they keep their browser open. Information is passed from page to page using something called a cookie. You don't need to worry about how this works; it's all handled automatically by PHP and the browser. But it is important to note that in PHP any page that you need to protect or any page that you need to put information into the session must call the session_start function.

Once that function has been called, this session associative array known as $_SESSION is created. And so this expression is set, $_SESSION returns true, if the session has started and false if it hasn't been. The rest of the code examines whether the current user has logged in, and then indicates with this variable, MM_ restrictGoTo, which page should be navigated to if the login fails. That's pretty much it.

If you want to apply this page restriction to all of your pages, you could copy this PHP code block, starting here at line 2, and going down to the end of the code block at line 46 into a separate PHP file, and then you could include that file in all of your other pages throughout the web site. I'm going to keep this demonstration focused on a single page though, so that we can see how the code that's generated by Dreamweaver works in its default state.

Now, to complete the cycle, I'll preview the page in Firefox. And now, I am going to log in with my user name and password, explorerone and password, and I'll click Submit. As long as I keep the browser open, I'll be able to navigate around throughout the web site. I can go to the Insert form and back. I can click Delete and delete a record, and I can also update data. If I close the browser though, and then restart the page, I'll see that my session has started over, and I am sent back to the Log In form.

Again, you can either protect each page individually, or you can take this generated code that to remove your places at the top of a page, move it into its own PHP file and then include it in all the pages that you want to protect. The default behavior is that any user who is logged in at all can see the protected pages, but you can also apply access levels, if you desire, to create a more granular security model.

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This video is part of

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Dreamweaver with PHP and MySQL

61 video lessons · 36332 viewers

David Gassner
Author

 
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  1. 8m 48s
    1. Welcome
      1m 25s
    2. What you should know before watching this course
      2m 17s
    3. Using the exercise files
      1m 40s
    4. Understanding the differences between Dreamweaver CS5.5 and CS6
      3m 26s
  2. 19m 31s
    1. Understanding static vs. dynamic web pages
      4m 32s
    2. Selecting application and database servers
      6m 10s
    3. Introducing Apache, MySQL, and PHP
      6m 36s
    4. Installing Apache, MySQL, and PHP
      2m 13s
  3. 39m 34s
    1. Defining a Dreamweaver site
      3m 22s
    2. Configuring a PHP testing server
      7m 48s
    3. Creating and testing a PHP-based web page
      8m 25s
    4. Adding PHP commands with the Insert panel
      3m 14s
    5. Setting and outputting simple variables
      3m 56s
    6. Testing pages with Live view and Live Code view
      2m 9s
    7. Using server-side includes
      7m 50s
    8. Navigating included pages with the Code Navigator
      2m 50s
  4. 36m 37s
    1. Using code hinting with PHP variables
      5m 31s
    2. Understanding PHP custom classes
      6m 38s
    3. Adding Zend Framework to PHP on Windows
      5m 18s
    4. Adding Zend Framework to PHP on Mac
      4m 2s
    5. Using the Site-Specific Code Hints feature
      3m 43s
    6. Using Zend Framework classes with code hints
      7m 26s
    7. Managing reusable code with the Snippets panel
      3m 59s
  5. 18m 27s
    1. Understanding relational databases
      5m 26s
    2. Creating a MySQL database in phpMyAdmin
      4m 41s
    3. Adding data in phpMyAdmin
      2m 46s
    4. Importing a completed database from a script
      5m 34s
  6. 39m 35s
    1. Defining a Dreamweaver database connection
      5m 27s
    2. Building a simple recordset
      4m 31s
    3. Building an advanced recordset
      5m 1s
    4. Displaying data with repeating regions
      6m 4s
    5. Displaying data in a dynamic table
      4m 15s
    6. Formatting dynamic data
      4m 54s
    7. Displaying the total number of records
      2m 4s
    8. Limiting records with paging controls
      4m 5s
    9. Creating conditional regions
      3m 14s
  7. 43m 12s
    1. Building a simple data entry form
      5m 27s
    2. Handling form submissions with PHP
      5m 12s
    3. Creating a customer email form
      3m 9s
    4. Validating form controls with Spry
      7m 54s
    5. Populating a list control with dynamic data
      4m 50s
    6. Working with multiple checkbox controls
      8m 5s
    7. Sending email with Zend_Mail
      8m 35s
  8. 50m 51s
    1. Using data wizards
      6m 20s
    2. Formatting dates for SQL
      5m 27s
    3. Creating a custom data entry form
      4m 50s
    4. Preparing a database table for server behaviors
      3m 3s
    5. Using the Insert Record server behavior
      5m 42s
    6. Preparing an update form
      7m 6s
    7. Using the Update Form behavior
      5m 46s
    8. Creating list page links to edit and update data
      7m 3s
    9. Using the Delete Record server behavior
      5m 34s
  9. 14m 45s
    1. Creating a login form with a PHP server behavior
      6m 29s
    2. Protecting page access with PHP server behaviors
      4m 17s
    3. Logging out with a PHP server behavior
      3m 59s
  10. 22m 50s
    1. Configuring a remote server with FTP credentials
      4m 42s
    2. Synchronizing site assets with the remote server
      5m 27s
    3. Exporting the MySQL database to a script
      3m 8s
    4. Importing the MySQL database on a remote server
      2m 24s
    5. Configuring the site for the remote database
      7m 9s
  11. 52s
    1. Final thoughts
      52s

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