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<?php declare(strict_types=1); function AddIntAndFloat(int $a, float $b): int { return (string) $a + $b; } try { echo AddIntAndFloat(1.4,'2'); } catch(TypeError $e) { echo $e->getMessage(), PHP_EOL; } try { echo AddIntAndFloat(1,'2'); } catch(TypeError $e) { echo $e->getMessage(), PHP_EOL; } try { echo AddIntAndFloat(1,1); } catch(TypeError $e) { echo $e->getMessage(), PHP_EOL; }