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程序中异常捕获的实际运用?

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Release： 2016-06-06 20:34:55
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程序中的捕获异常 在什么情况下使用？
是否抛出异常还是需要自己在程序中判断，那如果判断程序中的值不对 我直接调用自己的函数来处理就行了。为什么还需要放在异常里面处理？
新手:-D 请大家指点我一下。

回复内容：

程序中的捕获异常 在什么情况下使用？
是否抛出异常还是需要自己在程序中判断，那如果判断程序中的值不对 我直接调用自己的函数来处理就行了。为什么还需要放在异常里面处理？
新手:-D 请大家指点我一下。

  • 返回值可以被忽略，违背“早崩溃”原则
  • 返回值不带有详细的调试信息（backtrace等）
  • 大量返回值/错误码 分类需要通过丑陋的数组、in_array、switch等实现，Exception可以继承，天然具备分类机制
  • 返回值需要调用过程中的每一层级都做正确的处理（即使只是透明往外抛），而异常可以只关心抛异常的那一层和最终处理异常的那一层，中间的层级完全无感知
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