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<?php class Item { public static function newWithParent(Item $parent) { $item = new Item(); $item->parent = $parent; return $item; } private $parent; public function getParent() { return $this->parent; } } $item = Item::newWithParent(Item::newWithParent(Item::newWithParent(new Item()))); // Basically it's this now: {"parent":{"parent":{"parent":{"parent":null}}}} // I want to set that null value do { $item =& $item->getParent(); if ($item->getParent() === null) { $item = new Item(); break; } } while (true); var_dump($item);
Output for 7.0.0 - 7.1.0
Notice: Only variables should be assigned by reference in /in/kaSNT on line 23 Notice: Only variables should be assigned by reference in /in/kaSNT on line 23 Notice: Only variables should be assigned by reference in /in/kaSNT on line 23 object(Item)#2 (1) { ["parent":"Item":private]=> NULL }
Output for 5.3.0 - 5.6.28
Strict Standards: Only variables should be assigned by reference in /in/kaSNT on line 23 Strict Standards: Only variables should be assigned by reference in /in/kaSNT on line 23 Strict Standards: Only variables should be assigned by reference in /in/kaSNT on line 23 object(Item)#2 (1) { ["parent":"Item":private]=> NULL }
Output for 5.0.5 - 5.2.17
Strict Standards: Only variables should be assigned by reference in /in/kaSNT on line 23 Strict Standards: Only variables should be assigned by reference in /in/kaSNT on line 23 Strict Standards: Only variables should be assigned by reference in /in/kaSNT on line 23 object(Item)#2 (1) { ["parent:private"]=> NULL }
Output for 5.0.0 - 5.0.4

Process exited with code 139.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/kaSNT on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/kaSNT on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/kaSNT on line 4
Process exited with code 255.