Join David Powers for an in-depth discussion in this video Calculating the mean and median values, part of Code Clinic: PHP.
…Calculating mean and median averages is likely to be useful in other projects,…so I'm going to create a class within my foundation PHP name space.…Inside the foundation PHP folder, I've created a folder…called Calculate and inside there, a file called Average.php.…Class definitions should normally be in a separate…file, with the same name as the class.…And using the same directory structure as the name space, not only keeps the code…tidy, it also makes it possible to use…an auto-loader, a script that loads classes automatically.…
So, we need to declare the namespace.…And it will be foundationphp.…Calculate.…Then the class key word followed by the class name which is average.…And all of the class definition goes inside the braces.…We'll begin by creating two protected properties.…One for the array and the other to store the array length.…And we need to create the constructor.…So that's public function and constructors in PHP are all called the same.…It's double construct, and we want to make sure…that we have an array passed as the argument.…
David introduces challenges and provides an overview of his solutions in PHP. Challenges 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 challenges in languages like C#, C++, Java, Python, and Ruby.
Skill Level Intermediate
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-
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.
Q: I am unable to access the Lake Pend Oreille data from outside the U.S.
A: A static copy of this data is provided here for lynda.com members outside of the U.S
Problem One: Statistical Analysis
Problem Two: Image Analysis
Problem Three: Eight Queens
Problem Four: Accessing Peripherals
Problem Five: Recursion and Directories
Problem Six: Building the Web
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