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Enabling PHP

From: PHP with MySQL Essential Training

Video: Enabling PHP

In this movie, we're going to learn how to enable PHP on our Macintosh. If you remember the overview, I told you that OS 10.8 ships with PHP 5.3 already built in. Now it's already there, but it's not enabled, it's not turned on, meaning that Apache isn't ready to serve up PHP files. We're going to have to make a change to make that happen. In addition, 5.3 isn't the newest version of PHP. So we're also going to want to upgrade to a newer version, and I think it's instructive for you to see how to do that process. But we're going to start out by just getting version 5.3 up and running by enabling it. Let's see how.

Enabling PHP

In this movie, we're going to learn how to enable PHP on our Macintosh. If you remember the overview, I told you that OS 10.8 ships with PHP 5.3 already built in. Now it's already there, but it's not enabled, it's not turned on, meaning that Apache isn't ready to serve up PHP files. We're going to have to make a change to make that happen. In addition, 5.3 isn't the newest version of PHP. So we're also going to want to upgrade to a newer version, and I think it's instructive for you to see how to do that process. But we're going to start out by just getting version 5.3 up and running by enabling it. Let's see how.

So here I am in my terminal program, and I'm just going to start by typing php -v. And that's going to return the version of PHP that I have installed. You can see that I have PHP 5.315, yours might be slightly different. Notice also that it tells me that it's running Zend Engine v2. We talked about that in the history section, that PHP now runs on a Zend Engine. So, PHP is installed and we have version 5.3. But it's not active yet. We need to tell Apache, hey Apache, you need to be prepared for some PHP files, be prepared to process those.

And you do that by loading up one of your modules that knows how to interpret PHP. That module's included. It's just not turned on. So, in order to do that, we need to do some configuration to Apache. We're going to start by moving to Apache's configuration directory. That's going to be cd space slash etc slash apache2. This is where apache's config files are stored. If we type ls we will get a list of those and you can httpd.conf that's the file that we want. We know httdp is the nickname for Apache and conf for the config file. So in order to edit that, I'm going to use sudo to get my maximum amount of Unix privileges.

And then nano for my simple text editor. And then I'm going to edit that httpd.conf file. It's going to ask me for my password, that's the password I'm using when I'm installing software on my Mac. And here it is. Now, I have the conf file now open, I can browse this and make all sorts of changes and configurations to Apache. But I'm really only looking for one change, which is PHP. So, instead of browsing through this long document, says it's 500 lines long. I'm going to go straight to it, and you can see that one of the options at the bottom is Where Is. And the way to get that is Ctrl + W, and that will allow us to search for some text.

And what are we going to search for? PHP. So PHP and hit Return. It takes us straight there. So here it is, the PHP5 module. This is the module that gives Apache the knowledge about how to interpret PHP code. But it's not loaded right now. And how do I know that? Because this pound or hash sign that's at the beginning is telling it that this line is commented out, and not to be loaded. So I need to take that out. You won't be able to just use your mouse and click there. We are on the Command line. We want to use your Arrow keys. So move your cursor over to the L and just hit Delete to get rid of that. Now it has been un-commented, the next time that Apache loads this config file it will also load the module and to be able to read PHP code. So let's hit Ctrl + X to exit, Y in order to save the changes, and then Return to save them in the file name it suggests.

Okay, so that's been added to Apache but we need to also restart the server. We know how to do that. apachectl restart. Now it restarted. Now those changes have taken effect. PHP is loaded up, inside Apache, and it's ready to process our PHP files. Now, don't just take my word for it, let's actually try it out. Let's navigate to our sites directory, that's inside our user root which is that little squiggle followed by the forward slash and then our sites directory.

By list you'll see that I have my index.html file in there. I'm going to make a new one now using nano. And we don't need sudo in front of nano this time, we'll just making a simple text file, we don't need high level privileges. And I'm going to call it my_phpinfo.php. That's going to be the name of my file. It's going to open up here and I'm going to write my very first PHP code here. So just follow along. It's going to be a less than sign, a question mark php, a space phpinfo open and close parenthesis, semicolon space, question mark and then greater than sign. We'll talk about what all of these things mean, but the short version is that I've got PHP tags on either side of a command telling it what to do. So the beginning and ending bookends that have the question mark and the less than, greater than signs, those are the PHP tags telling it, hey, PHP is inside here. And then the command in the middle is the PHP info function that's being called. So now we go to our browser, and we request Apache to load up this PHP page. It's going to see that it ends in .php.

It's going to see the PHP tags. And it's going to process this command that's here in the middle. And we'll see the results of what that function will output. So let's do Ctrl + X to exit, Y to save our changes, and Return to keep that file name. We can see that it is here in my site's directory. Let's go to our browser, let's try it out. Localhost, remember, we need to put our username in front of this. And then my_phpinfo.php. So there it is.

It loaded it up, that PHP. And it processed it. And the results to the output of HTML decribing the entire configuration of PHP on this system. It's extremely useful command. First of all, because it tells you all the configuration, so you could review that and see how things are configured, see if there are any problems. But also, just because it is the simplest test that you can do to prove to yourself that PHP is working on this system. If the phpinfo page works, then Apache is able to handle serving up PHP, the problem's gotta be something else.

So that's it. We've now enabled PHP. And we could go ahead and we could start working with this and you can go through this tutorial. And almost everything that I'm going to show you in the tutorial is going to work just fine with version 5.3 of PHP. However, I want us to see how we can upgrade to a newer version. And we're going to do that next.

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This video is part of

Image for PHP with MySQL Essential Training
PHP with MySQL Essential Training

131 video lessons · 33240 viewers

Kevin Skoglund
Author

 
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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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