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<?php class Foo { private $a; public function __construct($a) { $this->a = (int) $a; } public static function extractA(self $aFoo) { return $aFoo->a; } } function max_by(array $aList, callable $aCallback) { return array_reduce($aList, function($carry, $item) use ($aCallback) { return ($carry == null || $aCallback($item) > $aCallback($carry)) ? $item : $carry; }); } $list = [ $foo1 = new Foo(2), $foo2 = new Foo(5), $foo3 = new Foo(1), ]; assert(max_by($list, ['Foo', 'extractA']) === $foo2);
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