我創(chuàng)建了一個(gè)查詢類來處理我所有的基本 sql 函數(shù)，在類中我有一個(gè)基本函數(shù)，它使用準(zhǔn)備好的語句插入數(shù)據(jù)，即“插入”函數(shù)，我不太清楚為什么，但我一直收到同樣的錯(cuò)誤（列出以上）每次我調(diào)用該函數(shù)時(shí)class Query{    private $conn;    private $table;    public function __construct($conn, $table)    {        $this->conn = $conn;        $this->table = $table;    }     public function Insert($fields, $placeholders, $binders, $values)     {        $field_val= implode(', ', $fields);        $ph=implode(', ', $placeholders);        array_walk($values, function(&$x) {$x = "'$x'";});        $val = implode(',  ', $values);        $query = 'INSERT INTO '.$this->table.' ('.$field_val.') VALUES('.$ph.')';        $stmt = $this->conn->prepare($query);        $stmt->bind_param(''.$binders.'', $val);        $stmt->execute();      }}這是用于將數(shù)據(jù)插入注釋表的函數(shù)的示例，連接來自模塊中包含的單獨(dú)數(shù)據(jù)庫文件    $database = new Database();    $conn = $database->connect();    //values    $comment_date = mysqli_real_escape_string($conn, htmlspecialchars($_POST['date-comment']));    $commenter = mysqli_real_escape_string($conn, htmlspecialchars($_POST['comment_name_of']));    $comment = mysqli_real_escape_string($conn, htmlspecialchars($_POST['comment']));    $comments_save = new Query($conn, 'nw_comments');    $fields = array('commenter_name', 'comment_value', 'date_commented');    $placeholders = array('?', '?', '?');    $binders = "sss";    $values = array($commenter, $comment, $comment_date);    $comments_save->Insert($fields,$placeholders,$binders,$values);