如何使用mysqli预处理语句绑定N个参数？

Question

在旧的mysql代码中，我在下面有一个查询，它完美地工作在下面：

$questioncontent = (isset($_GET['questioncontent'])) ? $_GET['questioncontent'] : '';

$searchquestion = $questioncontent;
$terms = explode(" ", $searchquestion);

$questionquery = "
SELECT q.QuestionId, q.QuestionContent, o.OptionType, an.Answer, r.ReplyType, 
  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 ";

    foreach ($terms as $each) {     
        $i++;         

        if ($i == 1){         
            $questionquery .= "q.QuestionContent LIKE `%$each%` ";     
            } else {         
                $questionquery .= "OR q.QuestionContent LIKE `%$each%` ";    
                 } 
                 }  

                 $questionquery .= "GROUP BY q.QuestionId, q.SessionId ORDER BY "; $i = 0; foreach ($terms as $each) {     
                     $i++;      

        if ($i != 1)         
        $questionquery .= "+";     
        $questionquery .= "IF(q.QuestionContent LIKE `%$each%` ,1,0)"; 
        } 

        $questionquery .= " DESC ";

但是因为那个旧的mysql正逐渐消失，人们说要使用PDO或mysqli（因为我目前得到的php版本不能使用PDO），我尝试将我的代码更改为mysqli，但这给了我问题。在下面的代码中我省略了bind_params命令，我的问题是如何在下面的查询中绑定参数？它需要能够绑定多个$each，因为用户可以输入多个术语，并且每个$each都被归类为术语。

以下是同一查询的当前mysqli代码：

     $questioncontent = (isset($_GET['questioncontent'])) ? $_GET['questioncontent'] : '';

        $searchquestion = $questioncontent;
        $terms = explode(" ", $searchquestion);

        $questionquery = "
        SELECT q.QuestionId, q.QuestionContent, o.OptionType, an.Answer, r.ReplyType, 
          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 ";

    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);      
            $stmt->execute();
            $stmt->bind_result($dbQuestionId,$dbQuestionContent,$dbOptionType,$dbAnswer,$dbReplyType); 
            $questionnum = $stmt->num_rows();

Answer 1

请参阅此SO Post，其中讨论了call_user_func_array与bind_param()的使用情况。

从PHP Docs on mysqli_stmt_bind_param开始说明以下内容......

  

注意：

     

结合使用mysqli_stmt_bind_param（）时必须小心   使用call_user_func_array（）。请注意mysqli_stmt_bind_param（）   要求参数通过引用传递，而   call_user_func_array（）可以接受变量列表作为参数   可以代表参考或价值。

你会想要使用这样的东西

call_user_func_array(array($stmt, 'bind_param'), $terms);

并且您可以确保在SQL字符串?中显示正确数量的$stmt个字符。

<强> [编辑]

这是一个有效的例子

// user entered search strings
$user_terms = array("a", "b", "c");

// append your wildcard "%" to all elements. you must use "&" reference on &$value
foreach ($user_terms as &$value) {
    $value = '%'.$value.'%';
}

$types = "";
for($i = 0; $i<sizeof($user_terms); $i++) {
    $types .= "s";
}

$terms = array_merge( array($types), $user_terms);

// the array $terms now contains: { "sss", "%a%", "%b%", "%c%" }

$sql = "SELECT ... ?,?,?"    // edit your sql here

$stmt = $mysqli->prepare($sql)

call_user_func_array(array($stmt, 'bind_param'), $terms);