Question

我正在连接到一个localhost数据库，为此我创建了一个类：

<?php

class Database
{
    private $host, $user, $pass, $db;

    /**
     * @var mysqli
     */
    private $link;

    public function __construct($host, $user, $pass, $db)
    {
        $this->host = $host; $this->user = $user;
        $this->pass = $pass; $this->db = $db;
    }

    public function connect()
    {
        $this->link = new mysqli($this->host, $this->user, $this->pass, $this->db);
        if ($this->link->connect_errno > 0) die("Cannot connect to server.");
    }

    public function getLink()
    {
        return $this->link;
    }

    public function reconnect($host, $user, $pass, $db)
    {
        $this->host = $host; $this->user = $user;
        $this->pass = $pass; $this->db = $db;
        $this->connect();
    }
}

我这样连接到它：

$database = new Database("localhost", "username", "password", "dbname");
$database->connect();
$mysqli = $database->getLink();

但当我var_dump mysqli变量时，它给我的全部是null的完整列表，如下：

object(mysqli)[2]
      public 'affected_rows' => null
      public 'client_info' => null
      public 'client_version' => null
      public 'connect_errno' => null
      public 'connect_error' => null
      public 'errno' => null
      public 'error' => null
      public 'error_list' => null
      public 'field_count' => null
      public 'host_info' => null
      public 'info' => null
      public 'insert_id' => null
      public 'server_info' => null
      public 'server_version' => null
      public 'stat' => null
      public 'sqlstate' => null
      public 'protocol_version' => null
      public 'thread_id' => null
      public 'warning_count' => null

为什么会这样？我之前没有做过多次不同的事情......

修改

var_dump的

$database：

object(Database)[1]
  private 'host' => string 'localhost' (length=9)
  private 'user' => string 'username' (length=4)
  private 'pass' => string 'password' (length=0)
  private 'db' => string 'dbname' (length=2)
  private 'link' =>
    object(mysqli)[2]
      public 'affected_rows' => null
      public 'client_info' => null
      public 'client_version' => null
      public 'connect_errno' => null
      public 'connect_error' => null
      public 'errno' => null
      public 'error' => null
      public 'error_list' => null
      public 'field_count' => null
      public 'host_info' => null
      public 'info' => null
      public 'insert_id' => null
      public 'server_info' => null
      public 'server_version' => null
      public 'stat' => null
      public 'sqlstate' => null
      public 'protocol_version' => null
      public 'thread_id' => null
      public 'warning_count' => null

重新启动Apache和MySQL无法解决问题

连接到mysql数据库返回（mysqli）对象fulla＆＃39;空值

0 个答案: