重拾Php语法

extract

var_dump
print_r

<?php 
        
            $_mysqli = new mysqli(‘localhost‘,‘root‘,‘abc123‘);
            
            $_mysqli->select_db("tablename");
            
            if($_mysqli->connect_errno)
            {
                //...
                echo "数据库连接出错，错误信息是：".$_mysqli->connect_error;
                exit();
            }
            
            $_mysqli->set_charset(‘utf8‘);
            
            $_Result = $_mysqli->query("sql");
            
            while($_rows = $_Result->fetch_array())
            {
                //...神奇点，每次打印一条，每次运行一次函数会将指针下移    
                print_r($_rows);
            }
            
            
        ?>