我在下面有一个代码示例,我正在尝试使用 call_user_func_array();
function make_values_referenced (&$arr) {
$refs = array();
foreach ($arr as $key => $value) {
$refs[$key] = &$arr[$key];
}
return $refs;
}
$selectedstudentanswerqry = "
SELECT q.SessionId, QuestionNo, QuestionContent, o.OptionType, q.NoofAnswers,
GROUP_CONCAT( DISTINCT Answer ORDER BY Answer SEPARATOR ',' ) AS Answer, r.ReplyType
FROM Question q ON (sa.QuestionId = q.QuestionId)
INNER JOIN Answer an ON q.QuestionId = an.QuestionId
LEFT JOIN Reply r ON q.ReplyId = r.ReplyId
LEFT JOIN Option_Table o ON q.OptionId = o.OptionId
";
// Initially empty
$where = array('q.SessionId = ?');
$parameters = array($_POST["session"]);
$parameterTypes = 'i';
// Check whether a specific student was selected
if($_POST["student"] !== 'All') {
$where[] = 'sa.StudentId = ?';
$parameters[] = $_POST["student"];
$parameterTypes .= 'i';
}
// Check whether a specific question was selected
// NB: This is not an else if!
if($_POST["question"] !== 'All') {
$where[] = 'q.QuestionId = ?';
$parameters[] = $_POST["question"];
$parameterTypes .= 'i';
}
// If we added to $where in any of the conditionals, we need a WHERE clause in
// our query
if(!empty($where)) {
$selectedstudentanswerqry .= ' WHERE ' . implode(' AND ', $where);
global $mysqli;
$selectedstudentanswerstmt=$mysqli->prepare($selectedstudentanswerqry);
// Make the referenced array
$referencedArray = make_values_referenced(array_merge(
(array($parameterTypes, $parameters))));
// You only need to call bind_param once
call_user_func_array(array($selectedstudentanswerstmt, 'bind_param'),make_values_referenced($referencedArray)); //LINE 331
}
$selectedstudentanswerqry .= "
GROUP BY sa.StudentId, q.QuestionId
ORDER BY StudentAlias, q.SessionId, QuestionNo
";
// get result and assign variables (prefix with db)
$selectedstudentanswerstmt->execute(); //LINE 341
$selectedstudentanswerstmt->bind_result($detailsSessionId,$detailsQuestionNo,
$detailsQuestonContent,$detailsOptionType,$detailsNoofAnswers,$detailsAnswer,$detailsReplyType); //LINE 344
$selectedstudentanswerstmt->store_result();
$selectedstudentanswernum = $selectedstudentanswerstmt->num_rows();
$selectedstudentanswerstmt->close();
现在我尝试在这里使用手册来指导我:http ://ca.php.net/manual/en/mysqli-stmt.bind-param.php#96770
我遇到的问题是我收到了很多错误,我的问题是我需要帮助纠正上面的代码才能解决这个问题。
Warning: mysqli_stmt::bind_param(): Number of elements in type definition string doesn't match number of bind variables in app/... on line 331
Warning: mysqli_stmt::execute(): (HY000/2031): No data supplied for parameters in prepared statement in /app/... on line 341
Warning: mysqli_stmt::bind_result(): (HY000/2031): No data supplied for parameters in prepared statement in app/... on line 344
Warning: mysqli_stmt::store_result(): (HY000/2014): Commands out of sync; you can't run this command now in app/... on line 348