Design patterns are an essential part of software development, providing a common language and best practices for recurring problems.

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The Singleton Pattern is a software design pattern that ensures a class has only one instance, while providing a global access point to that instance. This is useful in situations where it is necessary to limit the number of instances of a class, such as when managing resources or ensuring data integrity. In the world of PHP development, design patterns are particularly useful.

Real-World Examples of Using Design Patterns in Modern PHP

This is a great read!
I disagree with one of the patterns implementation, though:
A command should - from a natural perspective - not be able to execute itself. There must always be a sender as well as a receiver.
To give a stupendously simple example: When you give a command to your dog, the dog will be the receiver and the one to - if you’re lucky - execute the command. The command won‘t execute itself in dependence of the dog.
I tend to see many implementations using the pattern as described in the article, though I think it doesn’t make a whole lot of sense.

Good explanation on design patterns