我试图通过在 PHP 中构建错误答案列表来检索每个问题的错误答案。例如,通过包含原始查询中的单行,来计算错误答案,如下所示:
$query = "SELECT q.SessionId, s.SessionName, q.QuestionId, q.QuestionNo, an.Answer, an.AnswerId
FROM Session s
INNER JOIN Question q ON s.SessionId = q.SessionId
JOIN Answer an ON q.QuestionId = an.QuestionId
WHERE s.SessionName = ?
ORDER BY q.QuestionId, an.Answer
";
// prepare query
$stmt=$mysqli->prepare($query);
// You only need to call bind_param once
$stmt->bind_param("s", $assessment);
// execute query
$stmt->execute();
$specialOptionTypes = array(
'Yes or No' => array( 'Y', 'N' ),
'True or False' => array( 'T', 'F' ),
);
// Do this for each row:
if ( array_key_exists( $row->OptionType, $specialOptionTypes ) ) {
$options = $specialOptionTypes[ $row->OptionType ];
} else if ( preg_match( '/^([A-Z])-([A-Z])$/', $row->OptionType, $match ) ) {
$options = range( $match[1], $match[2] );
} else {
// issue warning about unrecognized option type
$options = array();
}
$right = str_split( $row->Answer ); // or explode() on a delimiter, if any
$wrong = array_diff( $options, $right );
// Fetch the results into an array
// get result and assign variables (prefix with db)
$stmt->bind_result($dbSessionId, $dbSessionName, $dbQuestionId, $dbQuestionNo, $dbAnswer, $dbAnswerId);
while ($stmt->fetch()) {
$incorrect_ans[] = $wrong;
}
....
//table row
<td class="answertd" name="incorrectanswers[]"><?php
echo $incorrect_ans[$key];
?></td>
我遇到的问题是我没有得到错误的答案,而是收到了几个错误:
第一个错误是针对$row
上面代码中显示的任何变量,其中指出:
注意:未定义的变量:row in ... on line ...
注意:试图在线获取...中非对象的属性...
第二个问题在上面的表格行中,而不是显示不正确的答案,而是显示Array
。
我的问题是如何修复通知和数组以至少有一个无错误的应用程序?