Join David Powers for an in-depth discussion in this video Implementing the checkLayout() function, part of Code Clinic: PHP.
- You've just seen the theory behind using…bitwise operators to check for diagonal attacks.…Let's translate that into PHP code in queens dot PHP.…I'm going to add the new code on line 41.…Just insert a couple of lines to give us some space and…then we'll create a function called "check diagonals."…This will take a single argument, it'll be "layout."…This will be one of the permutations…of the array of eight binary numbers representing the…position of the queen in each row on the chess board.…
Inside the function let's initialize a variable for the row.…So, we'll call that "row,' initialize it at zero.…Then we need to loop through each row.…So, we'll create a while loop that will run as long as…the row is less than the total number of rows,…and that's defined in the constant "board size."…So, while row is less than board size.…And we'll need to increment row at the end…of the loop to avoid having an infinite loop.…
We need to compare two rows at a time.…So, we'll create a variable called "offset"…inside the loop and let's put some comments in with…
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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