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                ### 類常量的聲明 可以把在類中始終保持不變的值定義為常量 在定義和使用常量的時候不需要使用 `$` 符號。 常量的值必須是一個定值,不能是變量,類屬性,數學運算的結果或函數調用。 ``` <?php class MyClass { const constant = "hello world"; function getConstant() { return self::constant; } } /* ---------- 外部訪問 ----------- */ echo MyClass::constant . PHP_EOL; /* ---------- 內部訪問 ----------- */ $myClass = new MyClass(); echo $myClass->getConstant() . PHP_EOL; ?> ```
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