Online PHP editor | rfc for IqmVh

@ 2014-12-09T19:57:33Z

<?php

// test data

class Foo {
    private $a;
    private $b;

    function __construct($a, $b)
    {
        $this->a = $a;
        $this->b = $b;
    }

    public function getA() { return $this->a; }
    public function getB() { return $this->b; }
}

$list = [
    $foo1 = new Foo(2, "bar"),
    $foo2 = new Foo(5, "baz"),
    $foo3 = new Foo(1, "bam"),
];


// simple

$isGreater = function($carry, $item) {
    return is_null($carry) || $item->getA() > $carry->getA() ? $item : $carry;
};

$maxOfList = array_reduce($list, $isGreater);
assert($maxOfList === $foo2);


// reusable max() function

$max = function($list, callable $extract) {
    $compare = function($carry, $item) use($extract) {
        return is_null($carry) || $extract($item) > $extract($carry) ? $item : $carry;
    };
    return array_reduce($list, $compare);
};

$extractA = function($x) { return $x->getA();};
assert($max($list, $extractA) === $foo2);

Output for git.master, git.master_jit, rfc.property-hooks

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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