PHP OOP中PDO数据库连接选项的正确配置与常见错误解析

<?php

class vicass
{
    // ... 其他属性 ...
    var $options; // 声明options属性

    function __construct()
    {
        $this->host = 'localhost';
        $this->username = 'root';
        $this->password = '';
        $this->database = 'vicas';
        $this->home_page = 'http://localhost/Vicas/index.php';

        // 正确定义了options为一个数组
        $this->options = array(
            PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ,
            PDO::ATTR_EMULATE_PREPARES   => false,
        );

        // 错误：将$this->options用双引号包裹，导致其被转换为字符串
        $this->connect = new PDO(
            "mysql:host=$this->host; dbname=$this->database",
            "$this->username",
            "$this->password",
            "$this->options" // 错误发生在这里
        );

        session_start();
    }

    // ... 其他方法 ...
}
?>

<?php

class vicass
{
    var $host;
    var $username;
    var $password;
    var $database;
    var $connect;
    var $home_page;
    var $query;
    var $data;
    var $statement;
    var $filedata;
    var $options;

    function __construct()
    {
        $this->host = 'localhost';
        $this->username = 'root';
        $this->password = '';
        $this->database = 'vicas';
        $this->home_page = 'http://localhost/Vicas/index.php';

        // 正确定义PDO连接选项数组
        $this->options = array(
            PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,   // 启用异常模式，方便错误调试
            PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ,           // 默认以对象形式获取结果
            PDO::ATTR_EMULATE_PREPARES   => false,                    // 禁用模拟预处理，使用原生预处理以提高安全性
        );

        // 正确：直接传递$this->options数组，不加双引号
        // 同样，username和password变量也不需要双引号，因为它们已经是字符串
        $this->connect = new PDO(
            "mysql:host=$this->host; dbname=$this->database",
            $this->username,
            $this->password,
            $this->options
        );

        session_start();
    }

    /**
     * 执行SQL查询
     * @return void
     */
    function execute_query()
    {
        $this->statement = $this->connect->prepare($this->query);
        $this->statement->execute($this->data);
    }

    /**
     * 获取查询结果的总行数
     * @return int
     */
    function total_row()
    {
        $this->execute_query();
        return $this->statement->rowCount();
    }

    /**
     * 页面重定向
     * @param string $page 目标页面URL
     * @return void
     */
    function redirect($page)
    {
        header('location:'.$page.'');
        exit;
    }
}
?>