Join David Powers for an in-depth discussion in this video Analyzing the image statistics, part of Code Clinic: PHP.
-The code that communicates with Image Magic…to identify the cropped images is in sub-image…underscore search dot php, which is…in the includes folder.…This file contains the definition for…a function called find sub-image.…The function takes five arguments.…The first two, large and small, are the…images being compared.…They're in the order required…by Image Magic's compare program.…The next two arguments, W small and H small,…are the dimensions of the smaller image,…it's width and height.…
The final argument, output folder, is the name…of the folder where a modified image…will be created if a sub-image is found.…Line five uses the exact function to call…Image Magic from the command line using…the arguments described in the previous video.…The exact function returns the last line…of output from the command line, and this…is stored as last line.…The next line defines a regular expression…to extract the results returned by Image Magic…from the last line variable.…
That's tested by preg match on the following line.…So let's see an example of how these two lines…
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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