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What you should know before watching this course

From: Code Clinic: PHP

Video: What you should know before watching this course

What you need to know to get the most out of the PHP If you already use PHP, I should warn you that the problems tackled in I'll be using name spaces so the minimum version of PHP needs to be 5.3.

What you should know before watching this course

What you need to know to get the most out of the PHP version of Code Clinic depends on who you are and why you're watching. Code Clinic has two main audiences. I expect most viewers will already use PHP and want to learn their skills. The other target audience consists of programmers, who use one or more other languages and who want to see how a particular problem is solved using PHP. If you already use PHP, I should warn you that the problems tackled in Code Clinic go way beyond the level of someone who's only just started learning.

You should already have a good understanding of PHP syntax and structures including arrays, functions, loops, and classes. I'll be using name spaces so the minimum version of PHP needs to be 5.3. Because PHP 5.3 is my baseline, I won't be using array or echo shorthand. Don't despair, if that list of requirements seems to exclude you. I've got a couple of beginner level courses here on lynda.com, introducing PHP and PHP for Web Designers.

My uploading files securely with PHP will bring you up to speed with classes and name spaces. If you're not a PHP developer, welcome aboard. Let me give you a quick overview of PHP. First of all, it's not a compiled language. The PHP script is written in plain text. And it's parsed by the zen engine on the web server. PHP's roots lie in making webpages interactive. So the code is often, but not always embedded in HTML.

PHP is not an object-oriented language, but it does have strong support for classes and objects. I'll be using a mixture of procedural and object-oriented code. Scripts and code blocks begin with an opening tag, which consists of an opening angle bracket and a question mark followed by PHP. The closing tag is a question mark followed by a closing angle bracket. When the file contains only PHP, the closing tag is optional.

In fact, it's recommended to omit it. Variables begin with a dollar sign and are case-sensitive. Like JavaScript, PHP variables are function-scoped, but unlike JavaScript, variables are not hoisted automatically to the top of the function. PHP is a loosely typed language. You don't need to declare a variables data type before hand. PHP also performs implicit casting or type juggling. Garbage collection is automatic, so there's rarely any need to free memory explicitly.

Every statement must end with a semicolon. Leaving out the semicolon, is one of the most common causes of syntax errors. Strings can be enclosed in single or double quotes. Inside single quotes, variables are treated as literal texts. Inside double quotes, the value of the variable is used. For example, if the value of name is Dolly, using single quotes like this outputs, Hello, $name. Whereas using double quotes outputs Hello, Dolly.

The concatenation operator in PHP is a dot or period. Because it can be difficult to see on the screen, its often recommended to leave a space on either side. So is PHP a good or a bad language? On the negative side, it has many inconsistencies. Related functions often use inconsistent naming conventions. And expect arguments in a different order. For that reason, it's a good idea to have an editing program with good PHP code hinting.

Joseph Lowery has a short course on choosing a PHP editor in the lynda.com library. On the positive side, PHP's easy to learn. Its widely supported and there's an active community that will help. It also has a huge number of built in functions. Not only for manipulating strings and arrays but for handling calculations, communicating with a data base, working with a file system and even image processing. In spite of its shortcomings, I like PHP.

I hope you do too.

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This video is part of

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Code Clinic: PHP

47 video lessons · 3896 viewers

David Powers
Author

 
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  1. 8m 49s
    1. Welcome
      1m 18s
    2. What you should know before watching this course
      4m 40s
    3. Using the exercise files
      1m 56s
    4. Getting the most from Code Clinic
      55s
  2. 1h 34m
    1. Introducing Lake Pend Oreille
      5m 4s
    2. Overview of my solution
      3m 22s
    3. Setting up the database
      4m 55s
    4. Retrieving the full-year records
      5m 20s
    5. Processing the full-year records
      10m 49s
    6. Priming the date_recorded column
      7m 47s
    7. Inserting the full-year data into the database
      6m 48s
    8. Processing individual days
      6m 54s
    9. Retrieving a year's data a day at a time
      7m 41s
    10. Keeping the data up to date
      4m 27s
    11. Calculating the mean and median values
      7m 21s
    12. Creating a web service
      6m 21s
    13. Getting the required data
      6m 50s
    14. Building the web service response
      10m 38s
  3. 49m 47s
    1. Identify the image subset
      3m 14s
    2. Overview of my solution
      3m 19s
    3. Setting up the files
      2m 43s
    4. Calculating the scaling ratio
      6m 28s
    5. Using a custom class to scale images
      6m 25s
    6. Generating the thumbnails
      7m 49s
    7. Using subimage-search in ImageMagick
      4m 32s
    8. Analyzing the image statistics
      4m 45s
    9. Finding the cropped images
      7m 13s
    10. Running the script and displaying the results
      3m 19s
  4. 39m 3s
    1. A classic CS interview question
      2m 4s
    2. Overview of my solution
      3m 48s
    3. Finding all possible combinations
      6m 26s
    4. Detecting horizontal attacks programmatically
      4m 8s
    5. Implementing the checkLayout() function
      6m 25s
    6. Rotating the chessboard
      4m 59s
    7. Eliminating duplicate solutions
      6m 34s
    8. Displaying the unique solutions
      4m 39s
  5. 21m 33s
    1. Build a musical instrument using mouse movements
      1m 35s
    2. Overview of my solution
      2m 1s
    3. Using the Web Audio API
      2m 47s
    4. Creating the tone generator
      7m 39s
    5. Controlling the frequency and volume
      7m 31s
  6. 31m 29s
    1. Searching directories for photos NEW
      2m 44s
    2. Overview of my solution NEW
      3m 24s
    3. Finding the images NEW
      5m 30s
    4. Extracting Exif and IPTC metadata NEW
      6m 18s
    5. Extracting XMP metadata NEW
      6m 22s
    6. Reorganizing the folder structure NEW
      7m 11s

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