I received the SQLSTATE[HY093] error: The number of bind variables does not match the number of tokens, below line 102 of comments.php:

id = (int) $data['id']; if ( isset( $data['publicationDate'] ) ) $this->publicationDate = (int) $data['publicationDate']; if ( isset( $data['title'] ) ) $this->title = preg_replace ( "/[^.,-_'"@?!:$ a-zA-Z0-9()]/", "", $data['title'] ); if ( isset( $data['content'] ) ) $this->content = $data['content']; if ( isset( $data['articleid'] ) ) $this->articleid = (int) $data['articleid']; } /*** Set the properties of the object using the POST value of the edit form * * @param assoc form POST value*/ public function storeFormValues( $params ) { // store all parameters $this->__construct( $params ); // Parse and store the release date if ( isset($params['publicationDate']) ) { $publicationDate = explode ( '-', $params['publicationDate'] ); if ( count($publicationDate) == 3 ) { list ( $y, $m, $d ) = $publicationDate; $this->publicationDate = mktime (0, 0, 0, $m, $d, $y); } } } public static function getById( $id ) { $conn = new PDO( DB_DSN, DB_USERNAME, DB_PASSWORD ); $sql = "SELECT *, UNIX_TIMESTAMP(publicationDate) AS publicationDate FROM comments WHERE id = :id"; $st = $conn->prepare( $sql ); $st->bindValue( ":id", $id, PDO::PARAM_INT ); $st->execute(); $row = $st->fetch(); $conn = null; if ( $row ) return new Comment( $row ); }/*** Return all (or a certain range of) article objects in the database * * @param int optional Number of rows to return (default is all) * @param string optional column according to which articles are sorted (default is "publicationDate DESC") * @return Array|false An array containing two elements: results => array, a list of article objects; totalRows => total number of articles*/ public static function getList( $art=1, $order="publicationDate DESC", $numRows=10000 ) { $conn = new PDO( DB_DSN, DB_USERNAME, DB_PASSWORD ); $sql = "SELECT SQL_CALC_FOUND_ROWS *, UNIX_TIMESTAMP(publicationDate) AS publicationDate FROM comments WHERE articleid = :art ORDER BY " . mysql_escape_string($order) . " LIMIT :numRows"; $st = $conn->prepare( $sql ); $st->bindValue( ":art", $art, PDO::PARAM_INT ); $st->execute(); $list = array(); while ( $row = $st->fetch() ) { $comments = new Comment( $row ); $list[] = $comment; } } /*** Insert the current article object into the database and set its ID attribute.*/ public function insert() { // 插入文章 $conn = new PDO( DB_DSN, DB_USERNAME, DB_PASSWORD ); $sql = "INSERT INTO comments ( publicationDate, title, content, articledid ) VALUES ( FROM_UNIXTIME(:publicationDate), :title, :content, :articleid )"; $st = $conn->prepare ( $sql ); $st->bindValue( ":publicationDate", $this->publicationDate, PDO::PARAM_INT ); $st->bindValue( ":title", $this->title, PDO::PARAM_STR ); $st->bindValue( ":content", $this->content, PDO::PARAM_STR ); $st->bindValue( ":articleid", $this->articleid, PDO::PARAM_STR ); $st->execute(); $this->id = $conn->lastInsertId(); $conn = null; } /** * 在数据库中更新当前的文章对象。*/ public function update() { // 更新文章 $conn = new PDO( DB_DSN, DB_USERNAME, DB_PASSWORD ); $sql = "UPDATE comments SET publicationDate=FROM_UNIXTIME(:publicationDate), title=:title, summary=:summary, content=:content, articleid=:articleid,imageExtension=:imageExtension WHERE id = :id"; $st = $conn->prepare ( $sql ); $st->bindValue( ":publicationDate", $this->publicationDate, PDO::PARAM_INT ); $st->bindValue( ":title", $this->title, PDO::PARAM_STR ); $st->bindValue( ":content", $this->content, PDO::PARAM_STR ); $st->bindValue( ":articleid", $this->articleid, PDO::PARAM_STR ); $st->bindValue( ":id", $this->id, PDO::PARAM_INT ); $st->execute(); $conn = null; } /*** Delete the current article object from the database.*/ public function delete() { // 删除文章 $conn = new PDO( DB_DSN, DB_USERNAME, DB_PASSWORD ); $st = $conn->prepare ( "DELETE FROM comments WHERE id = :id LIMIT 1" ); $st->bindValue( ":id", $this->id, PDO::PARAM_INT ); $st->execute(); $conn = null; } } ?>