我得到在我的剧本，我认为是造成搜索栏不上班此错误：
致命错误：调用一个成员函数bind_param（）的非对象在/web/stud/xxx/Mobile_app/previousquestions.php上线89上。
它指向该行是这一行：
$stmt->bind_param("s",$each);
需要为了解决这个错误，做什么？ 目前，该错误导致用户在搜索栏内提交的内容后没有结果出现。
<?php
//connect to db
$questioncontent = (isset($_POST['questioncontent'])) ? $_POST['questioncontent'] : '';
?>
<?php
if (isset($_GET['searchQuestion'])) {
$searchquestion = $questioncontent;
$terms = explode(" ", $searchquestion);
$parameters = array();
$questionquery = "
SELECT q.QuestionId, q.QuestionContent, o.OptionType, q.NoofAnswers, GROUP_CONCAT(an.Answer ORDER BY an.Answer SEPARATOR ' ') AS Answer, r.ReplyType,
q.QuestionMarks
FROM Answer an
INNER JOIN Question q ON q.AnswerId = an.AnswerId
JOIN Reply r ON q.ReplyId = r.ReplyId
JOIN Option_Table o ON q.OptionId = o.OptionId
WHERE ";
$i=0;
foreach ($terms as $each) {
$i++;
if ($i == 1){
$questionquery .= "q.QuestionContent LIKE ?";
} else {
$questionquery .= "OR q.QuestionContent LIKE ?";
}
}
$questionquery .= "GROUP BY q.QuestionId, q.SessionId ORDER BY "; $i = 0; foreach ($terms as $each) {
$i++;
if ($i != 1)
$questionquery .= "+";
$questionquery .= "IF(q.QuestionContent LIKE ?,1,0)";
}
$questionquery .= " DESC ";
$stmt=$mysqli->prepare($questionquery);
$parameters[] = ($each)
$stmt->execute($parameters);
$stmt->bind_result($dbQuestionId,$dbQuestionContent,$dbOptionType,$dbNoofAnswers,$dbAnswer,$dbReplyType,$dbQuestionMarks);
$questionnum = $stmt->num_rows();
}
?>
