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<?php class A { public function __destruct() { } } gc_disable(); $a1 = new A; $a2 = new A; $a1->ref = $a2; $a2->ref = $a1; $a1 = $a2 = NULL; echo('removed cycles: '.gc_collect_cycles());
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Creation of dynamic property A::$ref is deprecated in /in/m8p9l on line 12 Deprecated: Creation of dynamic property A::$ref is deprecated in /in/m8p9l on line 13 removed cycles: 2

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