Notification Free PHP Coding

This is a reply to http://100days.de/serendipity/archives/50-Notification-Free-PHP-Coding.html. Gaylord Aulke’s opinions are normally quite valuable. There are a couple of arguments (just read the comments) in both directions and to be fair, Gaylord also said, that his opinion is different for frameworks and libraries.

Even though I tend look into PHP notifications (some code produces so much of them, that you can only ignore them), I wasn’t really sure what my final position on Notification Free PHP Coding is and I was not too strict about it.

That changed today.

While demonstrating my reporting frontent for PHPUnit to the customer this month, I had to find out that it’s JUnit/XML logger sometimes produces broken XML files: You can get a “PCDATA invalid Char” exception when loading it with¬†DOMDocument::load(). Sebastian Bergmann encouraged me to send a pull request on github, which is nice. Except that I never contributed to PHPUnit before. Nor did I actively use github. Like Lars Jankowfsky I tend to stay with SVN, when possible (that’s probably worth another blog post).

Anyways: It was easy to fix the bug (actually, it turned out to be more complex) and after reading a couple of git manuals, I found out how to commit, push and send a pull request. The only thing I didn’t notice is that I used the constant _ENTQUOT (undefined) instead of _ENTQUOTES (defined) as an argument to htmlspecialchars() for some reason – this is why I recommend to focus on each line of code to other people…

htmlspecialchars(self::convertToUtf8($string), ENT_QUOT, 'UTF-8')

Not a big thing, if I would have seen the PHP notice!

Notice: Use of undefined constant ENT_QUOT - assumed 'ENT_QUOT'

It was not possible to see it, not because I did not look at the error messages or the test results, but because the default config for PHP on Ubuntu is _error_reporting = E_ALL & ~ENOTICE. To use an undefined constant is just plain wrong and leads to an undefined state of the software – it must be noticed. Also, whenever there are too much notices, you won’t be able to spot it. Therefore the only way to avoid it is to produce notification free code. I don’t want something¬†embarrassing¬†like this ever happen to me again.

Lesson learned.