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PHP with MySQL Essential Training
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What is PHP?


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PHP with MySQL Essential Training

with Kevin Skoglund

Video: What is PHP?

We're going to start out by talking about what is PHP? PHP is a server side scripting language. Now you may have thought that PHP was a programming language. Well, technically speaking, it's not. So how's a scripting language different from a programming language? The distinction between them is largely artificial, and the lines can get a bit blurry. But we can do a general comparison. A script only runs in response to an event. It also usually runs a set of instructions by working down the page from the start to the end. It has little or no user interaction after that initial event. So PHP script does not run until a web page is requested. Then it launches, follows its instructions from top to bottom, and then quits until another action launches the script again. On the other hand, a program, runs even when not responding to events. It continues to run, and to wait for interaction.
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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

What is PHP?

We're going to start out by talking about what is PHP? PHP is a server side scripting language. Now you may have thought that PHP was a programming language. Well, technically speaking, it's not. So how's a scripting language different from a programming language? The distinction between them is largely artificial, and the lines can get a bit blurry. But we can do a general comparison. A script only runs in response to an event. It also usually runs a set of instructions by working down the page from the start to the end. It has little or no user interaction after that initial event. So PHP script does not run until a web page is requested. Then it launches, follows its instructions from top to bottom, and then quits until another action launches the script again. On the other hand, a program, runs even when not responding to events. It continues to run, and to wait for interaction.

Whether that interaction comes from a user, making choices, or from other programs or input. A programs also jumps around with instructions a lot more. So that there's often not a clear start and end point. And it often involves lots of user interaction. Photoshop is a good example of an application. After you launch it, it keeps running, waiting for more interactions or for you to tell it to quit. The task that it performs are not a linear set of instructions. It jumps around based on the task that you want to do at that particular moment. But as I said, the lines get blurry as scripts get more complex, they start to resemble programs.

And the simplest programs are basically just scripts. So you could say it's a distinction without a difference. But we still call PHP a scripting language. Now what does it mean when we say PHP is server side. When we talk about server side and its opposite, client side. What we're talking about is where the code does its work. Does the code run on our web server, which is server-side, or on the user's computer, which is client-side? The client-side, when we're working with web pages, is the user's browser. As a contrast, JavaScript is an example of another popular scripting language, but JavaScript is a client-side scripting language.

JavaScript code is sent to the user's browser and then it does its work there. PHP code is never sent to the user. It runs entirely on the web server, and the results of that code is what's sent to the user's browser. That's an important difference. Because PHP runs on a web server, that means it generally can't run on its own. We'll need to have a running web server in order to use PHP. PHP code does not need to be compiled. It's executed by the web server exactly as it's written. Other programming languages, such as C or Java, require the code to be compiled or translated into another form before it can be used.

We'll be able to just write our PHP, put it where our web server can find it, and then we can load up the web page and see the results. PHP is designed for use with HTML. It can be embedded in our HTML. And we can use it to generate HTML. In the end PHP is going to return HTML to the browser. PHP code is going to be our input and web pages are going to be our output. Now if you've been working with HTML you're already familiar with having .htm or .html at the end of your file names. PHP is going to work exactly the same but we're going to put php at the end.

The php is going to tell the web server that this file contains php codes that needs to be executed. PHP is going to provide more flexibility than html does on it own. HTML pages are static by their nature. So all visitors to a web page see that same page all the time. A PHP lets us create dynamic pages. And page content can change based on conditions. Such as interactions with the user, or data stored in a database. You can think of PHP as turbo charging your html. PHP syntax is going to be very similar to C, Java, and Perl.

The small details are going to vary quite a bit, but the structure of logical expressions and loops, those kinds of things will be kind of familiar to anyone with programming experience in one of these languages. Now that we know what PHP is, in the next movie, we'll find out a little bit about the history of PHP.

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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