[输入输出](%E8%BE%93%E5%85%A5%E8%BE%93%E5%87%BA.md) [常量变量](%E5%B8%B8%E9%87%8F%E5%8F%98%E9%87%8F.md) [数据类型](%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B.md) [函数](%E5%87%BD%E6%95%B0.md) [面向对象](%E9%9D%A2%E5%90%91%E5%AF%B9%E8%B1%A1.md) [魔法方法](%E9%AD%94%E6%B3%95%E6%96%B9%E6%B3%95.md) [异常](%E5%BC%82%E5%B8%B8.md)