php程序接收数据时错误会返回一个错误编号吗?若有返回,这个编码是系统随机分配的还是说已经事先定义好了的?求解答,谢谢!
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php程序接收数据时错误会返回一个错误编号吗?若有返回,这个编码是系统随机分配的还是说已经事先定义好了的?求解答,谢谢!
必须是已经事先定义好,这样才能根据不同的错误编号做不同的业务处理
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