Join David Powers for an in-depth discussion in this video Displaying the unique solutions, part of Code Clinic: PHP.
- To display the solutions to the eight queens…problem, we need to loop through the array…of binary numbers in each permutation…to identify the location of the queen in each row.…We'll do that using a function called render board,…and you can find a copy of that…in render board dot txt in the exercise files…for this video.…I'm just going to add in some extra space…on line 105 and then paste it in.…You'll also need to copy crown dot png…and queens dot css from the exercise files…for this video.…
So let's take a look at what render board does.…It takes a single argument, layout, which is…one of the permutations of the unique solutions,…and then it renders an html table.…There are two loops inside the function.…The first loop goes through each row at a time,…and then the second loop goes through each square…within a row, so in other words it's going…through the columns, and it uses call as its counter.…The significant part of this code is on line 111.…
The condition compares the current array element…with one left shifted by the value of call.…
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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