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Michael Dyrynda:
Uploading files to Amazon S3 from the browser - Part One
Nov 06, 2017 @ 11:58:34

Michael Dyrynda has a tutorial posted to his site starting off a new series showing how to create the functionality in your application to upload files to Amazon S3 from the browser. The tutorial is designed for those that don't already have something in their framework that allows for this upload handling.

I recently took on a freelance project that involved having to upload media files. This is a trivially simple task to accomplish if you're using something like Laravel, using out-of-the-box support for S3 storage.

In this particular case, however, I was dealing with files potentially multiple gigabytes in size. Although a simpler to implement, I didn't want to have to have users of the site upload the file to my application - and thus server - before having my server re-upload the file to S3.

In his case, he needed something that would allow for the upload of very large files without having to pass it through the backend server to get there. He starts by walking you through the setup on the S3 side, creating an IAM policy for the upload and a form that points to the instance. The form includes a "key" value that contains the filename for the end result. He also shows some of the other options that can be included like the policy to use a redirect location and a signature to verify the upload. He then shows the code required to make it work, creating an upload route and a main form page that generates the signature and policy information for the form based on configuration options.

tagged: amazon s3 upload tutorial part1 series direct post

Link: https://dyrynda.com.au/blog/uploading-files-to-amazon-s3-from-the-browser-part-one

Matthew Weier O'Phinney:
Testing Code That Emits Output
Aug 25, 2014 @ 09:45:08

In this latest post to his site Matthew Weier O'Phinney gives his suggestion on how to test (unit test) code that provides some kind of direct output. In his case, his script is outputting header information directly, not as a part of a response string.

Here's the scenario: you have code that will emit headers and content, for instance, a front controller. How do you test this? The answer is remarkably simple, but non-obvious: namespaces.

He talks some about the use of namespaces in PHP classes (and methods, and constants...) and how things can be importing using them. He gives an example of an object that outputs some header and body information (an "Output" abstract class). He shows how to use the class in a simple test, calling "reset" in the setup and teardown methods and asserting the contents of the headers and body for expected content.

tagged: test unittest code phpunit output direct namespace tutorial

Link: http://mwop.net/blog/2014-08-11-testing-output-generating-code.html

PHPMaster.com:
Understanding Recursion
Jun 06, 2013 @ 09:32:41

On PHPMaster.com today there's a new tutorial posted that talks about something that can be a more difficult concept for budding developers to grasp - recursion.

In one of my previous articles I wrote about iterators and how you can use them. Today I’d like to look at the fraternal twin of iteration: recursion. A recursive function is one that calls itself, either directly or in a cycle of function calls. Recursion can also refer to a method of problem solving that first solves a smaller version of the problem and then uses that result plus some other computation to formulate an answer to the original problem.

He starts with an example - one function showing how to calculate a factorial using just looping and the other by having the function call itself. He talks some about the different types of recursion (direct/indirect) and gives a more practical example, a "find in array" function for one with nested subarrays. He also briefly mentions "head" and "tail" recursion, the difference being if it waits for a return value or not. He also offers some general advice when it comes to using recursion and how you have to watch for optimization issues.

tagged: recursion tutorial introduction head tail direct indirect

Link: http://phpmaster.com/understanding-recursion