interface Collection<T> { public function add(T $item): void; public function get(int $index): T; } class StringCollection implements Collection<string> { // ... } $stringCollection = new StringCollection(); $stringCollection->add("Hello"); $stringCollection->add(123); // ã¨ã©ã¼ï¼string åãæå¾ ããã¦ãã¾ã

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