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@ 2017-01-12T20:32:50Z

<?php


final class DbConnection
{
    private $dsn;
    private $initializer;
    public function __construct(string $dsn)
    {
        $this->dsn = $dsn;
        // socket stuff happens here, much like with PDO
    }

    public function query(string $queryString) : array
    {
        ($this->initializer)();
        // irrelevant from here on
        return ['query' => $queryString, 'dsn' => $this->dsn];
    }

    public static function lazyInstance(string $dsn) : self
    {
        $instance = (new ReflectionClass(self::class))->newInstanceWithoutConstructor();
        $instance->initializer = function () use ($dsn, $instance) {
            $instance->__construct($dsn);
            $instance->initializer = function () {
            };
        };
        return $instance;
    }
}

$instance = DbConnection::lazyInstance('mysql://something');

var_dump($instance);

var_dump($instance->query('SELECT * FROM foo'));
var_dump($instance->query('SELECT * FROM bar'));

Output for git.master, git.master_jit, rfc.property-hooks: object(DbConnection)#2 (2) { ["dsn":"DbConnection":private]=> NULL ["initializer":"DbConnection":private]=> object(Closure)#1 (1) { ["static"]=> array(2) { ["dsn"]=> string(17) "mysql://something" ["instance"]=> *RECURSION* } } } array(2) { ["query"]=> string(17) "SELECT * FROM foo" ["dsn"]=> string(17) "mysql://something" } array(2) { ["query"]=> string(17) "SELECT * FROM bar" ["dsn"]=> string(17) "mysql://something" }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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