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<?php $reporting = error_reporting(E_ERROR | E_COMPILE_ERROR); $result = false; try { $result = eval('function(?int $a){};return true;'); } catch (Throwable $e) { } catch (Exception $e) { // ignore } error_reporting($reporting); $isSupported = true === $result; var_dump($isSupported);
Output for git.master, git.master_jit, rfc.property-hooks
bool(true)

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