Join David Powers for an in-depth discussion in this video Creating a web service, part of Code Clinic: PHP.
…In my editing program, I've opened podata.php.…Which you can find in the 01_12 folder of the exercise files.…We'll use it as the basis for creating a web service to…calculate the mean and median averages for a given range of dates.…And return the results as adjacent string.…The first few lines, initialize for variables.…Then the code on lines 9 through 16 uses the get super global array.…To retrieve the start date and end date variables…from the query string at the end of the URL.…
A web service will accept a start date of its own.…So if endDate hasn't been set, startOnly is set to true.…Both the end date and the start date are…past the verifyDate function, which is defined further below.…So let's take a look at what verifyDate does.…It begins by trimming leading and trailing white space.…Then if the value isn't numeric or if…it doesn't have exactly eight characters it returns false.…
But if the value looks okay, the year,…month, and day are extracted using the substring function.…They are then passed to the PHP checkdate function, that checks if it's a real date.…
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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