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<?php $s = fopen('php://memory', 'w'); var_dump($s, is_resource($s), gettype($s)); fclose($s); var_dump($s, is_resource($s), gettype($s));
Output for rfc.property-hooks, git.master, git.master_jit
resource(5) of type (stream) bool(true) string(8) "resource" resource(5) of type (Unknown) bool(false) string(17) "resource (closed)"

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