PHP mysqli_connect：当我的登录页面试图连接到数据库时，我遇到了这个错误

我是新来的sqli，PHP的改进版

<?php

// Class for the transparent access of MySQL

$con = mysqli_connect("host","database","port","user","passwd","conn","querytext","query_id","err","errno","record = array();","row = 0;","rows = 0;") or die ("Some error occured during connection " . mysqli_error($con));

        function query($querystring) {
                $this->querytext = $querystring;
                $this->query_id = mysqli_query($this->querytext, $this->con);
                $this->Errno = mysqli_errno($this->conn);
                $this->Error = mysqli_error($this->conn);
                if($this->query_id) {
           if(strtolower(substr(trim($this->querytext),0,6)) == 'select'){
                        $this->rows = mysqli_num_rows($this->query_id);
                   } else {
                        $this->rows = 0;
           }
                        $this->row = 0;
                } else {
                        $this->rows = 0;
                        $this->row = 0;
                        $this->halt("Query failed!");
                }
        }

        function setpassword($newpasswd){
           $querystring = sprintf("SET PASSWORD = PASSWORD('%s')", $newpasswd1);
           return $this->query($querystring);
        }

        function next_record() {
                if($this->row < $this->rows) {
                        $this->record = mysql_fetch_array($this->query_id);
                $this->Errno = mysql_errno($this->conn);
                $this->Error = mysql_error($this->conn);
                        $this->row +=1;
                        $status = is_array($this->record);
                } else {
                        $status = FALSE;
                }
                return $status;
        }


        function seek($pos) {
                if(($pos >= 0 && $pos < $this->rows) &&
                   mysql_data_seek($this->query_id, $pos)) {
               $this->Errno = mysql_errno($this->conn);
               $this->Error = mysql_error($this->conn);
                       $this->row = $pos;
                }
        }


        function close() {
                $this->query = "";
                $this->rows = 0;
                $this->row = 0;
                mysql_close($this->conn);
        }

        function htmltable () {
                $resulttable='';
                if($this->rows > 0){
                        $resulttable=sprintf("<table %s>", $tableoptions);
                        while($this->next_record()) {
                                /* Ueberschriften */
                                if($this->row == 1) {
                                        $resulttable=$resulttable . "<tr>";
                                        while(list($key, $value)=each($this->record)){
                                                $resulttable=$resulttable . "<th>" . $key . "</th>";
                                        }
                                $resulttable=$resulttable . "</tr>\n";
                                reset($this->record);
                                } /* Ende Ueberschriften */
                                $resulttable=$resulttable . "<tr>";
                                while(list($key, $value)=each($this->record)){
                                        $resulttable=$resulttable . "<td>" . $value . "</td>";
                                }
                                $resulttable=$resulttable . "</tr>\n";
                        }
                        $resulttable=$resulttable . "</table>\n";
                }
                return $resulttable;
        }



?>

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您应该使用PDO连接到数据库，因为它更安全：

下面这些教程非常好：

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另外，请确保您的数据库凭据位于一个单独的文件中，该文件包含在您用于连接数据库的文件中。

错误消息是什么？天哪，mysqli_connect是否接受了那么多参数？哈哈$this->query\u id=mysqli\u query$this->querytext$this->con；这绝对是失败的。在mysqli中，连接是第一位的，而不是第二位。这里的错误太多了。最好你回去和RTM的。@Dwza可怕，你会是正确的-谢谢我正在检查turorials@goerge。我可以请助手帮我查询函数。我需要有关查询函数的帮助。我还没有很好地定义我的代码