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@ 2015-12-31T02:08:23Z

<?php

/**
 * @property stdClass $x
 * @property stdClass $y
 */
class C {
    private $buffer = array();
    
    function __get($key) {
        if (array_key_exists($key, $this->buffer)) {
            return $this->buffer[$key];
        }
        $f = 'calc_' . $key;
        $v = $this->$f();
        if (array_key_exists($key, $this->buffer)) {
            return $this->buffer[$key];
        }
        return $this->buffer[$key] = $v;
    }
    
    function calc_x() {print __METHOD__ . "\n";
        $x = new stdClass;
        $x->y = $this->__get('y');
        return $x;
    }
    
    function calc_y() {print __METHOD__ . "\n";
        $y = new stdClass;
        // Set a stub to avoid infinite recursion.
        $this->buffer['y'] = $y;
        $y->x = $this->__get('x');
        return $y;
    }
}

$c = new C;
$x = $c->x;
$y = $c->y;
var_dump($x->y === $y, $y->x === $x);

print "\n";
$c = new C;
$y = $c->y;
$x = $c->x;
var_dump($x->y === $y, $y->x === $x);

Output for git.master, git.master_jit, rfc.property-hooks: C::calc_x C::calc_y C::calc_x bool(true) bool(true) C::calc_y C::calc_x bool(true) bool(true)

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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