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run code in 150+ php & hhvm versions
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<?php global $ary; class C { public $ref; public function __construct() { $this->ref = $this; } public function __destruct() { global $ary; $ary[] = $this; } } new C; gc_collect_cycles(); var_dump($ary); ?>
Output for 7.0.0 - 7.1.0
array(1) { [0]=> object(C)#1 (1) { ["ref"]=> *RECURSION* } }
Output for hhvm-3.10.0 - 3.12.0
NULL
Output for 5.6.0 - 5.6.22
array(1) { [0]=> object(C)#1 (1) { ["ref"]=> &UNKNOWN:0 } }
Output for 5.3.0 - 5.5.36
array(1) { [0]=> object(C)#1 (1) { ["ref"]=>
Process exited with code 139.
Output for 5.1.3 - 5.2.17
Fatal error: Call to undefined function gc_collect_cycles() in /in/DogYT on line 17
Process exited with code 255.
Output for 5.0.0 - 5.1.2
Fatal error: Call to undefined function gc_collect_cycles() in /in/DogYT on line 17
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/DogYT on line 6
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/DogYT on line 6
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/DogYT on line 6
Process exited with code 255.