Join David Powers for an in-depth discussion in this video Using a custom class to scale images, part of Code Clinic: PHP.
The php GD extension which is enabled in most php…configurations does an excellent job of creating thumbnail…images but the function names can sometimes be confusing.…On the wanted actually scales and image, this one image…copy resampled takes no few as in 10 arguments.…All of them required.…Generating thumbnails is a very common task.…I've created accustomed php class…to take care of all the complexity.…The class definition is in scale.php…which is in the foundation php image handling folder.…
Scale is a very common name.…The class used as foundation php image handling…has a name space to avoid potential clashes.…Foundation php is based on my domain name foundationphp.com.…The class definition is fully commented…but all go through the main points.…It begins by declaring several protected properties.…Let's just scroll down and take a look at some of them.…Source folder defaults to the current folder…and the output folder defaults to scaled.…
The scaling ratio defaults to 0.0505 percent.…The construct the method takes three arguments, only one…
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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