Phpstan array

PHPStan 1.

Currently, it is not possible to define explicit array types as other programming languages do as Java does. There have been some attempts to achieve that. One of the most recent ones was done by Nikita Popov in this pull request. Hopefully, some tools like PHPStan or Psalm help us to analyze the code statically, which means, they do not execute but check the code for inconsistencies based on PHP comments. This is a fashioned way to define a list of elements from a certain type, the problem is it becomes ambiguous, and clients that use this kind of list cannot know if keys are integers, floats or strings. We use lists when we have an array of elements with the same type.

Phpstan array

In some cases PHPStan knows about the literal value of an expression. Some types exist to only consist of other types learn more about union vs. This table describes which implementation is used for different bounds the X in template T of X :. Following list is by no means complete, please see the interface code for more details. The describe method returns a string representation description of the type, which is useful for error messages. For example StringType returns 'string'. The accepts method tells us whether the type accepts a different type. For example FloatType also accepts IntegerType. There are methods that answer questions about properties, methods, and constants accessed on a type. To understand how it works we need to imagine types as circles. The biggest circle containing all other types is mixed also known as the top type.

In PHPStan 1.

It has a point of course, purely from static analysis it cannot reliably be inferred that c will always be of the string[] type - the phpdoc typehint declares it could be a string as well some day. In my practical case however, due to the definition of the API I'm calling, I cannot know beforehand that a and b are the only string keys, only that all non- c keys will be string keys with string values. Array shape does, to my knowledge, not support any definition for unknowns, for example the following are all unacceptable:. See lines 20 and I can now put anything I want in the array. How can this pass for level 9 with strict rules enabled?

Two years ago I wrote an impactful article on union and intersection types. It helped the PHP community to familiarize themselves with these concepts which eventually led to intersection types support in PhpStorm. I wrote that article because the differences between unions and intersections are useful and important for static analysis, and developers should be aware of them. Today I have a similar goal. Generics are coming to PHPStan 0. Also check out practical examples in the Generics By Examples article.

Phpstan array

Static analysis is a great tool to ensure the integrity of your code. Strongly typed languages get this for free, but since PHP is a dynamically typed language, we have to use tools like PHPStan to reap the same benefits. As you can see in the signature of the greet function, the parameter is typed. We explicitly state that this function requires a string argument. PHP will throw an exception when we pass it anything that cannot be safely converted to a string. When will it throw the exception, though?

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Sponsor PHPStan! Types in non-canonical form can and should be simplified. Read more about union types here ». Array shapes allow each key and value to be different. Until one day when someone requests to take on multiple roles. We can use the PHP comments on arrays anywhere class properties, function params, inline initialization…. Create a new saved reply. So if a parameter is assigned by reference, the type after the function call is always mixed :. Because in runtime T might contain something that falls inside the E circle like InvalidArgumentException or something that falls outside of the E circle like TypeError. How can this pass for level 9 with strict rules enabled? One of the most recent ones was done by Nikita Popov in this pull request. For example FloatType also accepts IntegerType. In some cases PHPStan knows about the literal value of an expression. So it seems there's multiple bugs: array shapes are not handled strictly, but once they are I can no longer define this valid use case of PHP arrays.

This problem is reported by PHPStan on level 6 when typehinting an array or an iterable object as a parameter type or a return type. Solving this for arrays is straightforward - PHPStan needs to know what the array consists of.

This feature is inspired by array shapes but represents objects with public properties with specified types:. PHPStan checks that the values in specified keys have the correct types:. How can this pass for level 9 with strict rules enabled? Home Try Documentation Blog. Read more about intersection types here ». We use lists when we have an array of elements with the same type. The describe method returns a string representation description of the type, which is useful for error messages. Generics » , Generics By Examples ». Written as Type1 Type2. It tells the relationships between types - which one is more general and which one is more specific see Querying a specific type. Attach files.