PHP7 の新しい匿名クラス: コードの柔軟性とスケーラビリティを向上させるには?

$data = [1, 2, 3, 4, 5];
$result = array_map(function($value) {
    return new class($value) {
        private $value;
        
        public function __construct($value) {
            $this->value = $value;
        }
        
        public function getValue() {
            return $this->value;
        }
    };
}, $data);

foreach ($result as $obj) {
    echo $obj->getValue() . ",";
}
// 输出：1,2,3,4,5,

function processRequest($callback) {
    $data = [1, 2, 3, 4, 5];
    $result = [];
    foreach ($data as $value) {
        $obj = new class($value) {
            private $value;
            
            public function __construct($value) {
                $this->value = $value;
            }
            
            public function getValue() {
                return $this->value;
            }
        };
        
        $result[] = $callback($obj);
    }
    
    return $result;
}

$result = processRequest(function($obj) {
    return $obj->getValue() * 2;
});

print_r($result);
// 输出：Array ( [0] => 2 [1] => 4 [2] => 6 [3] => 8 [4] => 10 )

function validateData($data, $rules) {
    return array_filter($data, new class($rules) {
        private $rules;
        
        public function __construct($rules) {
            $this->rules = $rules;
        }
        
        public function isValid($value) {
            foreach ($this->rules as $rule) {
                if (!$rule($value)) {
                    return false;
                }
            }
            
            return true;
        }
    });
}

$data = [1, 2, 3, 4, 5];
$rules = [
    function($value) {
        return $value % 2 == 0;
    },
    function($value) {
        return $value > 3;
    }
];

$result = validateData($data, $rules);

print_r($result);
// 输出：Array ( [2] => 3 )