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<?php class ResourceType { public function __destruct() { echo "Resource is released.\n"; } } function get_callback() { $some_resource = new ResourceType(); $fn = function() use($some_resource) { // // why is my lock released? var_dump($some_resource); // "Free that resource" $some_resource = null; }; return $fn; } $fn = get_callback(); echo "Before callback\n"; $fn(); echo "After callback\n";
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Before callback object(ResourceType)#1 (0) { } After callback Resource is released.

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