<?php class A { private $bObj; public function __construct() { $this->bObj = new B($this); } } class B { private $owner; public function __construct($owner) { $this->owner = $owner; } } var_dump(memory_get_usage()); $aObj = new A(); var_dump(memory_get_usage()); unset($aObj); gc_collect_cycles(); var_dump(memory_get_usage()); // memory uncleared!!!
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