Feature - Raise minimum PHP version to 8.0

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php: [ '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
+        php: [ '8.0', '8.1', '8.2', '8.3', '8.4' ]
 
     steps:
       - uses: actions/checkout@master

README.md

@@ -10,8 +10,7 @@ or recursively instantiating them with *DependencyResolver* itself.
 ## Features
 
 - Based on PSR-11
-- Supports PHP 8 (8.0, 8.1, 8.2, 8.3 and 8.4) — full support of union type hints, and other modern features.
-- PHP 7.1+ compatible
+- Supports modern PHP 8 features (up to PHP 8.4) — full support of union type hints, and others.
 - Recursive dependencies autowiring
 - Semver
 - Tests

composer.json

@@ -9,14 +9,14 @@
         "auto-wiring"
     ],
     "require": {
-        "php": "^7.1|^8.0",
-        "psr/container": "^1.0|^2.0",
-        "technically/null-container": "^1.0",
-        "technically/callable-reflection": "^0.4.0"
+        "php": "^8.0",
+        "psr/container": "^2.0",
+        "technically/null-container": "^2.0",
+        "technically/callable-reflection": "^0.4.2"
     },
     "require-dev": {
         "peridot-php/peridot": "^1.19",
-        "technically/array-container": "^1.0"
+        "technically/array-container": "^2.0"
     },
     "license": "MIT",
     "authors": [

src/DependencyResolver.php

@@ -16,10 +16,7 @@
 
 final class DependencyResolver
 {
-    /**
-     * @var ContainerInterface
-     */
-    private $container;
+    private ContainerInterface $container;
 
     public function __construct(?ContainerInterface $container = null)
     {
@@ -28,14 +25,14 @@ public function __construct(?ContainerInterface $container = null)
 
     /**
      * @param string $className
-     * @return mixed|object|void
+     * @return mixed
      *
      * @throws InvalidArgumentException If class does not exist.
      * @throws ContainerExceptionInterface If error occurs while retrieving the existing entry from the container.
      * @throws ClassCannotBeInstantiated If class cannot be instantiated.
      * @throws CannotAutowireDependencyArgument If a dependency (of any nesting level) cannot be resolved.
      */
-    public function resolve(string $className)
+    public function resolve(string $className): mixed
     {
         if (! class_exists($className) && ! interface_exists($className)) {
             throw new InvalidArgumentException("`{$className}` is not a valid class name.");
@@ -51,11 +48,12 @@ public function resolve(string $className)
     /**
      * @param string $className
      * @param array $bindings
+     * @return mixed
      *
      * @throws ClassCannotBeInstantiated
      * @throws CannotAutowireDependencyArgument
      */
-    public function construct(string $className, array $bindings = [])
+    public function construct(string $className, array $bindings = []): mixed
     {
         if (! class_exists($className) && ! interface_exists($className)) {
             throw new InvalidArgumentException("`{$className}` is not a valid class name.");
@@ -84,7 +82,7 @@ public function construct(string $className, array $bindings = [])
      * @throws ArgumentCountError
      * @throws CannotAutowireArgument
      */
-    public function call(callable $callable, array $bindings = [])
+    public function call(callable $callable, array $bindings = []): mixed
     {
         $reflection = CallableReflection::fromCallable($callable);
 
@@ -130,7 +128,7 @@ private function resolveParameters(array $parameters, array $bindings = []): arr
      *
      * @throws CannotAutowireArgument
      */
-    private function resolveParameter(ParameterReflection $parameter)
+    private function resolveParameter(ParameterReflection $parameter): mixed
     {
         foreach ($parameter->getTypes() as $type) {
             if ($type->isClassRequirement() && $this->container->has($class = $type->getClassRequirement())) {

src/Exceptions/CannotAutowireArgument.php

@@ -9,7 +9,7 @@ final class CannotAutowireArgument extends DependencyResolutionException
     /**
      * @var string
      */
-    private $argumentName;
+    private string $argumentName;
 
     /**
      * @param string $argumentName

src/Exceptions/CannotAutowireDependencyArgument.php

@@ -9,12 +9,12 @@ final class CannotAutowireDependencyArgument extends DependencyResolutionExcepti
     /**
      * @var string
      */
-    private $dependencyName;
+    private string $dependencyName;
 
     /**
      * @var string
      */
-    private $argumentName;
+    private string $argumentName;
 
     /**
      * @param string $dependencyName

src/Exceptions/ClassCannotBeInstantiated.php

@@ -5,9 +5,9 @@
 final class ClassCannotBeInstantiated extends DependencyResolutionException
 {
     /**
-     * @var string
+     * @var class-string
      */
-    private $className;
+    private string $className;
 
     public function __construct(string $className)
     {
@@ -17,7 +17,7 @@ public function __construct(string $className)
     }
 
     /**
-     * @return string
+     * @return class-string
      */
     public function getClassName(): string
     {