Online PHP editor | rfc for Td9oe

@ 2018-12-22T02:12:17Z

<?php

interface DepInterface {}

class Dependency implements DepInterface {
    public function __construct($param1, $param2) {}
}

class NotDI {
    protected $dep;
    
    public function __construct() {
        // 1. if we ever change the constructor of the Dependency class we now need to
        //    go fiddle with the implementation in every class ever.
        // 2. not only that, now this class needs to know the proper configuration for
        //    its dependency, which is not necessarily something it need be responsible for
        // 3. we now have a hard dependency on this one, concrete implementation.
        $this->dep = new Dependency('foo', 'bar');
    }
}

class IsDI {
    protected $dep;
    
    public function __construct(DepInterface $dep) {
        // Now we no longer need care how the object is instantiated, or what it even is
        // so long as it implements the interface that we are expecting.
        $this->dep = $dep;
    }
}

$dep = new Dependency('foo', 'bar');
$johnny = new IsDI($dep);

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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