How To Start Using Generic Types In PHP

• Psalm

  45 5,434 9.9 PHP

  A static analysis tool for finding errors in PHP applications

  

root@2fde6041ad38:/app# vendor/bin/psalm public/test.php Target PHP version: 8.1 (inferred from current PHP version) Scanning files... Analyzing files... E ERROR: UndefinedPropertyFetch - public/test.php:29:1 - Instance property ServiceB::$serviceAProperty is not defined (see https://psalm.dev/039) $serviceLocator->getService(ServiceB::class)->serviceAProperty; ERROR: InvalidScalarArgument - public/test.php:88:28 - Argument 1 of CallbackExecutor::execute expects callable(int):string, pure-Closure(string):float provided (see https://psalm.dev/012) $callbackExecutor->execute(fn(string $value) => (float) $value, 1); ------------------------------ 2 errors found ------------------------------ 3 other issues found. You can display them with --show-info=true ------------------------------ Psalm can automatically fix 1 of these issues. Run Psalm again with --alter --issues=MissingReturnType --dry-run to see what it can fix. ------------------------------ Checks took 0.49 seconds and used 75.842MB of memory Psalm was able to infer types for 98.6486% of the codebase

• PHPStan

  59 12,536 9.9 PHP

  PHP Static Analysis Tool - discover bugs in your code without running it!

  

In theory, everything looks nice. There is only one small problem - PHP does not have built-in generic types. Although a few years ago there was the RFC, but it was not implemented. Fortunately, there are tools for static code analysis, such as Psalm or PHPStan, which, by reading appropriate annotations in the code, are able to imitate the generic types.

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