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@ 2015-12-31T01:45:37Z

<?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;
        return $this->buffer[$key] = $this->$f();
    }
    
    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;
$c->y;

Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: C::calc_x C::calc_y C::calc_x bool(true) bool(false) C::calc_y C::calc_x
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 C::calc_x C::calc_y C::calc_x bool(true) bool(false) C::calc_y C::calc_x

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