Phpstan array

PHPStan 1. My role has shifted from the main code contributor to quality assurance, project vision [1]phpstan array, and taking phpstan array of the continuous integration pipeline. At the current rate of quality pull requests from rvanvelzen1 markusstaab and herndlm I might just rename my job title to "green button pusher". This feature was developed by Richard van Velzen.

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.

Phpstan array

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. We use object shape when the array is not a collection of objects but a map which holds information. There are multiple advantages when using these PHP comments, not only provide better feedback on the array shape to the developers but IDEs will suggest auto-completion when iterating on individual elements! We can use the PHP comments on arrays anywhere class properties, function params, inline initialization…. Edit me.

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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.

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? This means it will bother your users. Compiled languages like Haskell or TypeScript will analyze your code in the compile step, and warn about possible type inconsistencies. Because PHP is not compiled, there is not a moment in the lifecycle of a script in which to pick up a possible error like this.

Phpstan array

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. If your codebase makes use of arrays of various specific shapes passed around functions and methods, PHPStan can check that the values in specified keys have the correct types. This is different from general arrays that mandate that all the keys and values must be of a specific homogeneous type. Array shapes allow each key and value to be different. The error can also be solved by using generics with the help of extends , implements and use annotations. All three basic iterable types Iterator , IteratorAggregate , Traversable accept two type variables:.

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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. But it can also be used to read custom PHPDocs or class attributes. Sponsor PHPStan! In short, it means a string that is either written by a developer or composed only of developer-written strings. Sponsor PHPStan! Give feedback. This feature was developed by Markus Staab. Discussion options. This feature enables usage of strong types in codebases where arrays of various specific shapes are passed around functions and methods. Already have an account? Beta Was this translation helpful? Comment options. The supertype always wins.

PHP 8 is just around the corner! PHPStan is ready to analyse your codebases that will be taking advantage of the latest features in the coming weeks and months.

You switched accounts on another tab or window. Home Try Documentation Blog. Array shape does, to my knowledge, not support any definition for unknowns, for example the following are all unacceptable:. So any interface or non-final class can have an infinite number of child classes. Select a reply. Reload to refresh your session. PHPStan has excessive tests for the built-in types in TypeCombinatorTest which is a great starting point to learn from. There have been some attempts to achieve that. A string can be a callable. Twitter Mastodon RSS.