The project
You can find the code here.
Prerequisite
You just have installed composer due to this script uses psr-4 autoloading.
Usage
If you have a more complex situation like this
class Foo {}
class Bar { public function __construct(Foo $foo) {} }
class Pub {
public function __construct(Bar $bar) {}
public function method() {
return 42;
}
}
class Animal { }
class Cat { public function __construct(Animal $animal) {} }
class Fizz {
public function __construct(private Pub $pub) {}
public function doSomething(Cat $cat) {
return $this->pub->method();
}
}
You can instance Fizz object and the run doSomething method just doing
$result = injector(Fizz::class, 'doSomething');
5 line solution
This solution is not readable. Is just to create a clickbait.
function injector($instance, $method = '__construct', $deps = []) {
foreach ((new \ReflectionMethod($instance, $method))->getParameters() as $dep) {
$className = (string) $dep->getType();
$deps[] = new $className;
}
return $method == '__construct' ? new $instance(...$deps) : injector($instance)->$method(...$deps);
}
Readable solution
This is a readable solution.
function buildDeps($instance, $method, $deps = []) {
$params = (new \ReflectionMethod($instance, $method))
->getParameters();
foreach ($params as $dep) {
$className = (string) $dep->getType();
$deps[] = new $className;
}
return $deps;
}
function injector($instance, $method = '__construct') {
$deps = buildDeps($instance, $method);
return $method == '__construct'
? new $instance(...$deps)
: injector($instance)->$method(...$deps);
}
And if you want to see the entire process of its creation (but, sorry, only in italian) click here.
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