Join David Powers for an in-depth discussion in this video Priming the date_recorded column, part of Code Clinic: PHP.
…The script that we've created in process_years.php.…We'll extract the air temperature, the barometric pressure and…wind speed from the text files for 2001 to 2010.…That's nine and a half years data, but there's a small problem.…We'll end up with data only for those days when measurements were actually taken.…Some days have no data, perhaps because…the equipment was close down for maintenance.…If someone requests dates for which there's no…data, the web service needs to report that fact.…
So before processing the files, we need to prime the date recorded column in the…database with values to ensure there's a record…for every day, even when there's no data.…So we'll create a new PHP file to do that.…And we'll call it prime_dates.php.…The data in the text files begins on the 12th…of January, 2001, so that's the first date that we need.…So we'll create an instance of the PHP date time class.…
We'll store that as startDate.…We parse that the date, we put it in the ISO format of year amongst date.…So, 2001-01-12.…
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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