Question

这个例子：

<?php

    class MyCustomException extends Exception {

    }

    class MyClass implements JsonSerializable {

        function jsonSerialize() 
        {
            throw new MyCustomException('For some reason, something fails here');
        }

    }

    try {
        json_encode(new MyClass);
    } catch(Exception $e) {
        print $e->getMessage() . "\n";
    }

将输出：Failed calling MyClass::jsonSerialize()。如何获得MyCustomException，这是导致此错误的真正原因？

Answer 1

答案在previous类的Exception属性中。要获得原始异常，try - catch块应该稍微改变一下：

try {
    json_encode(new MyClass);
} catch (Exception $e) {
    if ($e->getPrevious()) {
        print $e->getPrevious()->getMessage() . "\n";
    } else {
        print $e->getMessage() . "\n";
    }
}

也可以重新抛出此异常：

try {
    json_encode(new MyClass);
} catch (Exception $e) {
    if ($e->getPrevious()) {
        throw $e->getPrevious();
    } else {
        throw $e;
    }
}

获取触发的异常＆＃34;调用MyClass失败:: jsonSerialize（）＆＃34;例外

1 个答案: