如何使用异常处理或错误处理来停止页面以显示特定的警告(参见详细信息) - How do I stop the page to display a particular warning (see detail), using exception handling or error handling?

How do I stop the page to display a particular warning (see detail), using exception handling or error handling?

我收到这个特殊的警告:

警告:在C:'xampp'htdocs'OnlineQuiz'Resultpage.php中除零第98行

我使用了除法表达式。像这样:

Ratio = Correct answers/Attempted questions

如果两者都为0，我将得到警告。但我不想这样。我只想要一条消息，而不是这个错误。如何处理这个问题?

通过在操作前添加@符号来忽略错误:

Ratio = @Correct answers/Attempted questions

http://php.net/manual/en/language.operators.errorcontrol.php

在操作前添加@符号以忽略错误报告/消息

Ratio = @Correct_answers / $Attempted_questions

除法前需要检查$Attempted_questions不为零:

if ($Attempted_questions != 0) {
  $Ratio = $Correct_answers / $Attempted_questions
}

您可以简单地使用try..catch和throw作为

function makeratio($Correct_answers, $Attempted_questions) {
    if (!$Attempted_questions) {
        throw new Exception('Division by zero');
    }
    return $result = ($Correct_answers / $Attempted_questions);
}
try {
    echo makeratio($Correct_answers, $Attempted_questions);
} catch (Exception $e) {
    echo 'Caught Exception : ' . $e->getMessage();
}