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<?php class CoalesceTest { public function __isset(string $key): bool { return false; } public function __get(string $key): mixed { throw new \Exception(); } } $test = new CoalesceTest(); var_dump($test->bar ?? 'fallback');
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
string(8) "fallback"

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78.41 ms | 1100 KiB | 4 Q