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例外をcatchして更にthrowする場合は前の例外をセットする癖をつける

Last updated at Posted at 2017-11-17

自分が忘れがちなのでメモ。
スタックトレースで発生源までたどれるようになります。

public __construct ([ string $message = "" [, int $code = 0 [, Throwable $previous = NULL ]]] )

$previousを設定する

function base_test()
{
    try
    {
        // エラー判定省略
        throw new RuntimeException('エラー詳細1');

        // エラー判定省略
        throw new RuntimeException('エラー詳細2');

        // エラー判定省略
        throw new RuntimeException('エラー詳細3');
    }
    catch (RuntimeException $exception)
    {
        throw new RuntimeException('エラーが発生しました', 0, $exception);
    }
}

function test()
{
    try
    {
        $this->base_test();

        return true;
    }
    catch (RuntimeException $exception)
    {
        // スタックトレースをログに残す
        error_log($exception, 0);
        return false;
    }
}
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