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Code Clinic: PHP
Illustration by Don Barnett

Code Clinic: PHP

with David Powers

Video: Searching directories for photos

- Hello and welcome to Code Clinic. My name is David Powers. Code Clinic is a monthly course, where a unique problem is introduced to a collection of lynda.com authors. In response, each author creates a solution using their programming language of choice, mine is PHP. You can learn several different things from Code Clinic. Different approaches to solving a problem, the pros and cons of different languages, and some tips and tricks to incorporate into your own coding practices.
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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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Watch the Online Video Course Code Clinic: PHP
4h 4m Intermediate Jul 15, 2014 Updated Nov 18, 2014

Viewers: in countries Watching now:

Many successful programmers know more than just a computer language. They also know how to think about solving problems. They use "computational thinking": breaking a problem down into segments that lend themselves to technical solutions. Code Clinic is a series of six courses where lynda.com authors solve the same problems using different programming languages. Here, David Powers works with PHP.

Each month, David will introduce a new challenge and provide an overview of his solution in PHP, explaining how he broke the problem up into logical components, and revealing the difficulties he encountered. Challenges will include topics such as statistical analysis, searching directories for images, and accessing peripheral devices.

Visit other courses in the series to see how to solve the exact same challenge in languages like C#, C++, Java, Python, and Ruby. And check back every month for new challenges.

Subjects:
Developer Programming Languages
Software:
PHP
Author:
David Powers

Searching directories for photos

- Hello and welcome to Code Clinic. My name is David Powers. Code Clinic is a monthly course, where a unique problem is introduced to a collection of lynda.com authors. In response, each author creates a solution using their programming language of choice, mine is PHP. You can learn several different things from Code Clinic. Different approaches to solving a problem, the pros and cons of different languages, and some tips and tricks to incorporate into your own coding practices.

This month, the problem combines two concepts: recursion and accessing image data. Recursion means to repeat something in a similar way. In programming, recursion means a function will actually call itself, nesting a call to a subroutine within a call to the same subroutine. You might find this type of code pattern in the code samples you're about to see. Although some languages might have structures that handle recursion automatically.

JPEG files can contain additional image data stored as Exif or IPTC. Exif stands for exchangeable image file format and is a well-documented standard. If you have a digital camera or have taken photos with a newer smartphone, the image probably has Exif data available. IPTC was developed by the International Press Telecommunications Council. The standard was adopted by Adobe Photoshop, and it's widely used by stock photo agencies to embed information about images.

You can see this metadata information on a Mac by opening the image in Preview and going to Tools, Show Inspector and selecting the Exif or IPTC tab. On Windows, you can see the metadata by Right-Clicking an image, selecting Properties, and the Details tab. You'll see things like caption, dimensions, camera type, color space, exposure Information, and other details. Cell phones will also embed geographic location data, identifying the longitude and latitude.

The challenge is to look through the example files included with Code Clinic, find images, extract the caption from the metadata. Then reorganize those photos into an alphabetical folder structure based on the caption. As always, you may want to take some time to solve the problem yourself. In the next videos, I'll show you how I solve this challenge.

Find answers to the most frequently asked questions about Code Clinic: PHP .


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Q: I'm encountering script errors message with the prime_dates.php file used in the "Priming the date_record column" movie in this course. How can I resolve these errors?
A: To avoid script errors, use bindValue() instead of bindParam() in Line 9 of the prime_dates.php file. You can also download the latest copy of the exercise files, which corrects this issue for you. For a more in-depth explanation of the difference between bindValue() and bindParam(), check out the "Binding input and output values" video (http://www.lynda.com/PHP-tutorials/Binding-input-output-values/169106/181062-4.html) in Accessing Databases with Object-Oriented PHP.

Q: Why can't I access the Lake Pend Orielle site (http://lpo.dt.navy.mil)?

A: The Lake Pend Orielle site is not accessible in some geographical areas. We have contacted the owner of the server to try to resolve this issue.

 
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