- PHP wasn't really created to solve complex problems…such as the eight queens,…but that doesn't mean it can't do it.…In fact, it does it extremely well.…The solution I'm about to present was posted…anonymously on rosettacode.org,…so let's take a look.…If we scroll down, we can see many…languages have been used to solve this problem…is the PHP one.…Although the script is commented…there's no explanation of the underlying logic.…So, I've adapted the script slightly…mainly by changing the names of variables…in some functions to make it easier to understand.…
It's an ingenious use of Bitwise Operators.…These work on binary numbers…which consist of a series of ones and zeros.…Perhaps their most common use in PHP is in PHP constants.…You might have seen this in the PHP configuration…file PHP.INI E underscore All…and E underscore notice are constants.…Although their written as text,…they actually represent numbers.…The single ampersand and the (itlida) are Bitwise Operators…that work on the binary equivalence of the numbers.…
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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