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<?php /** * @extends ArrayObject<string, mixed> */ final class TypedArrayObject extends ArrayObject { public function getString(string $name): string { $value = $this[$name] ?? null; if (!is_string($value)) { throw new ValueError('Value at "' . $name . '" is not a string.'); } return $value; } public function getInteger(string $name): int { $value = $this[$name] ?? null; if (!is_int($value)) { throw new ValueError('Value at "' . $name . '" is not an integer.'); } return $value; } } $foo = new TypedArrayObject([ 'a' => 'hello', 'b' => 5, ]); $int = $foo->getInteger('b'); $string = $foo->getString('a');
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