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Derick Rethans:
Not Finding the Symbols
Dec 01, 2016 @ 09:58:22

In this new post to his site Derick Rethans about an issue that was discovered with the newer version of the PHP MongoDB driver dealing a JSON encoding/decoding error.

Yesterday we released the new version of the MongoDB Driver for PHP, to coincide with the release of MongoDB 3.4. Not long after that, we received an issue through GitHub titled "Undefined Symbol php_json_serializable_ce in Unknown on Line 0".

The driver makes use of the JSON extension's "JsonSerializable" interface to handle some of the BSON types (like binary data). They were surprised that, despite running their tests on a wide range of builds they never came up with this same issue, compiling them from source. The key here is that the JSON extension is bundled along with the binary when compiled this way however some linux distributions do things differently. They ship it as a separate module and, because this could potentially be missing, a JSON error like the one reported could occur. He goes on to talk about some specific examples from various distributions and the simple fix - ensure the JSON extension is loaded before the MongoDB driver is loaded in your installation. This prevents the JSON handling from being missing and the JSON-related error message from popping up.

tagged: mongodb driver undefined symbol error message extension troubleshoot

Link: https://derickrethans.nl/undefined-symbol.html

Rob Allen:
Handing JSON data errors in Slim 3
Nov 16, 2016 @ 09:12:01

For the Slim framework users out there Rob Allen has a quick new post to his site showing an easy way to handle JSON data errors in a Slim 3 application (besides just a silent failure).

When you send JSON data into a Slim Framework application with a content-type of application/json, then Slim will decode it for you if you use getParsedBody(). [...] If there's an error however, you get [an empty response]. If you care about this, you can use json_last_error_msg() and return an error.

He includes a code example of using this function on an endpoint, providing more information on why the JSON parsing failed. He also includes a "bonus" that makes use of the jsonlint library to inspect the JSON message and provide back a more human-readable message letting the user know what exactly was wrong with the JSON they provided.

tagged: json error slim slimframework jsonlint tutorial jsonlasterrormsg

Link: https://akrabat.com/handing-json-data-errors-in-slim-3/

Scotch.io:
Handling Laravel Validation Error Messages With Vue.js
Nov 02, 2016 @ 10:32:28

The Scotch.io blog has posted a new tutorial for the Laravel+Vue.js users out there helping you effectively handle validation error messages output through the Vue.js portion of the application.

Recently, I launched a open source side project I was working on called Open Laravel. Open Laravel allows developers to submit open source projects that were built using the Laravel framework. The project submission page uses Vue.js to submit the form asynchronously through an AJAX request. Since I am no longer sending the form the default way (refreshing after form submission), I needed a way to show Laravel form validation error messages. After going back and forth with some forum questions and answers, I was able to make it work.

The tutorial starts you out with a fresh install of Laravel and runs a npm install to get the Laravel Elixir dependencies. They then add in the other dependencies (like Vue.js itself and the use-resource package). Next up are changes on the Laravel side: adding required routes, setting up a "Posts" controller and making a simple view with the form to take in post content. They provide the Javascript for the Vue.js side as well, making use of the vue-resource to connect the form with the POST request to the backend. Finally they tie in the "FormError" component and have it either show failure messages or success messages when everything's good.

tagged: tutorial vuejs laravel form submit vueresoruce error message

Link: https://scotch.io/tutorials/handling-laravel-validation-error-messages-with-vue-js

Master Zend Framework:
Whoops, I Forgot The Error Handler
Sep 21, 2016 @ 12:57:32

The Master Zend Framework site has posted a new tutorial for those out there looking for a bit more from their error handler than just some basic text. In this tutorial Matthew Setter introduces you to the Whoops error handler and how to use it in your Zend Expression application.

Ever experienced HTTP 500’s, but found that your error logs are empty. Ever had no clue why or how this could be happening? Perhaps you forgot to enable the Whoops error handler.

That’s right, perhaps, when you were setting up a Zend Expressive application, you made the mistake which I made recently when you used the Zend Expressive Skeleton Installer. [...] If you chose n, and used a templating engine, then TemplatedErrorHandler, would have been used as PHP's default exception handler.

As a result, no exceptions will be written in your logs. Sure, you’ll see that a 500 error has occurred somewhere in your application. But, the only information you’ll have is [a simple 500 error message].

He notes that the next step for most developers is the log files, trying to find a hint there of what might have broken. If you chose the default logger, nothing will be there as it captures those issues and pushes them to the basic error template (but doesn't output them). He points to where in the configuration you can check to see if you enabled the Whoops error handler and how to test it after you've made the switch. The reason the default is the basic message is that, in production, you don't want information exposed and log messages/code shown to just anyone - that's a big security risk.

tagged: whoops error handler zendexpressive enabled tutorial output

Link: http://www.masterzendframework.com/whoops-errorhandler/

Alejandro Celaya:
Creating a content-based Error Handler for Zend Expressive
Jul 29, 2016 @ 09:26:38

In a post to his site Alejandro Celaya shares a method he worked up for creating a content-based error handler in Zend Expressive - a method of changing the error output based on the content it was passed and the Accept header provided.

In one of my tests of the REST API I saw that when an error occurs (404, 405 or 500), I was getting an HTML response, which is not easy to handle when the client is expecting JSON.

I started to dig on how to fix this problem and thought that using ErrorMiddleware (which is invoked in case of an error) should be the solution, but after some tests I saw that it is only invoked if a regular middleware invokes the next one by passing an error as the third argument or an uncaught exception is thrown. When a route is not matched (404) or it is matched with an incorrect HTTP method (405), the error middleware is not invoked.

After confirming (on Twitter) that this was the intended result he went about looking for another option. He looked into using "Final Handlers" that are called when nothing else matches in the middleware execution chain. They didn't provide one for JSON handling, however, so he had to create his own (code is included in the post) and explains a bit of how it's handling the data and HTTP response code. Unfortunately using this handler made the error output always return JSON so another piece was needed, the content-based detection handler that switches between types based on the Accept header.

tagged: content error handler zendexpressive tutorial json output

Link: http://blog.alejandrocelaya.com/2016/07/29/creating-a-content-based-error-handler-for-zend-expressive/

Thijs Feryn:
What are Type Errors in PHP 7?
Jul 15, 2016 @ 09:58:19

In a new post to his site Thijs Feryn has shared an overview of the different types of type errors that can pop up in PHP 7. This includes both a text-based and video based versions depending on your preference.

PHP 7 has a concept called Type Errors. These errors are thrown on a type mismatch when interacting with functions. They can be caught just like exceptions. I created a video that explains the situation. This blog post goes into more detail and has some code examples.

The post gets into the details of the type errors including topics like:

  • new type hints that were introduced
  • how you can manually throw type errors
  • when PHP itself would throw the errors
  • type coercion

There's also a brief section about strict typing and how that changes what errors PHP might throw in your scripts.

tagged: type error php7 introduction overview video tutorial

Link: https://blog.feryn.eu/type-errors-php-7/

Christian Weiske:
PHP: Allowed memory size exhausted
Jul 12, 2016 @ 12:17:20

Christian Weiske has a post to his site with a reminder about a common misconception that can happen because of the wording in a standard PHP message about memory exhaustion.

The indieweb.org wiki has a page about Wordpress with a Criticism section. ?

One of those "issues" listed is Fatal Error memory exhausted [...but] I removed that section because it's nonsense to list a server configuration issue as Criticism.

While the admins reverted the change to put the message back, Christian clarified what meaning of the error message to help clarify the situation. In the case if the example message, the "32 bytes" it mentions is not the amount of total memory it's trying to allocate, it's the amount it last tried and failed at. Christian also points out the role that PHP's own memory_limit setting has on when this message might pop up.

tagged: allowed memory size exhausted error message clarification

Link: http://cweiske.de/tagebuch/php-memory-exhausted.htm

Liip Blog:
Let’s debug in Drupal 8 !
Jun 20, 2016 @ 09:23:37

In a new post to the Liip blog Karine Chor shares some helpful Drupal 8 debugging tips and things you can do to determine what you code is doing "under the covers".

It has been nearly 7 months since Drupal 8 first release and as a developer, I am still in the learning process. It can be hard sometimes to know what is going wrong with your code and how to solve it. I will tell you about few things to know on how to develop and debug Drupal 8 projects and continue learning, learning and learning !

Her tips cover topics like:

  • Disabling cache
  • Displaying errors
  • Creating log messages
  • Debugging Twig templates
  • Profiling pages

The post ends with a section covering use of the the Drupal command line tool to provide even more real-time debugging functionality.

tagged: debugging drupal8 commandline cache error log twig profiler tutorial

Link: https://blog.liip.ch/archive/2016/06/20/lets-debug-drupal-8.html

Rob Allen:
Improved error handling in Slim 3.2.0
Feb 26, 2016 @ 10:46:53

In this recent post to his site Rob Allen, a developer with the Slim framework project, covers some of the improvements around error handling in the latest version of the framework, v3.2.0.

We released Slim 3.2.0 yesterday which includes a number of minor bug fixes since 3.1.0 and also a few nice improvements around the way we handle errors.

He talks about the previous error handling (suppressing them in favor of a bland error page) and how v3.2.0 changes this by writing them to the error log by default. He also talks about changes around the addition of a PHP 7 error handler that works with the PHP 7 Error exception types and functions the same way as the default Exception handler.

tagged: slim slim3 slimeframework error handling improvement errorlog exception php7

Link: https://akrabat.com/improved-error-handling-in-slim-3-2-0/

Rob Allen:
PSR-7 file uploads in Slim 3
Feb 05, 2016 @ 11:08:23

In a post to his site Rob Allen explains how to handle file uploads in a PSR-7 structure, specifically illustrating with an example using the Slim (v3) framework.

Handling file uploads in Slim 3 is reasonably easy as it uses the PSR-7 Request object, so let's take a look.

He shows how to create a simple index route in a Slim application and render a view containing just a simple form with an upload field and submit button. When the form submits, he uses the getUploadedFiles method on the Slim Request object to get the file information for the upload. He also shows how to check for errors on the upload using the file data as an object and calling the getError method.

tagged: slim3 file upload tutorial handling error psr7 request

Link: https://akrabat.com/psr-7-file-uploads-in-slim-3/