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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 7.1.0 - 7.1.7, 7.1.20 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
bool(true)
Output for 7.1.10

Process exited with code 137.
Output for 5.6.0 - 5.6.27, 7.0.0 - 7.0.20
bool(false)
preferences:
105.33 ms | 1610 KiB | 4 Q