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Did you know that DateImmutable isn't really immutable?

Read more [matthiasnoback.nl]

Michael Dyrynda explains how you can use immutable dates in Laravel by default.

Read more [dyrynda.com.au]

Jeff Madsen wrote down a good piece that explains how mutable Carbon dates can lead to some nasty bugs. I would't mind if Chronos were to be promoted to the default datetime library in Laravel.

If you hang out on any sort of programming forums you have no doubt encountered “The Great Mutable vs. Immutable Debate”. While I’m sure you know what the words mean, if you are new to programming or don’t have a strong Computer Science background it might not be obvious to you whether this is an important concept to be concerned with, or just more “architecture astronaut” purists arguing some obscure fine point.

To help you answer that for yourselves, I’m going to show you the difference between the two using two popular Php DateTime libraries — Carbon and Chronos, and then demonstrate the danger of using the mutable one of those.

https://medium.com/@codebyjeff/whats-all-this-immutable-date-stuff-anyway-72d4130af8ce

If you want to read more cool articles by Jeff, be sure to subscribe to his excellent newsletter.

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In a new article on his blog Frank De Jonge demonstrates a lesser known feature/bug of PHP.

When two objects are of the same type, they can access the private properties of the other. This might seem like a bug, but it's actually a very valuable feature. For instance, it allows you to perform very efficient equality checks without the need to publicly expose your internals.

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