php 连接数据库 , 插入记录
$username = "root";
$password = "123";
// 建立连接
mysql_connect('localhost', $username, $password);
// 选择连接数据库
mysql_select_db("test");
// 插入数据
mysql_query("insert into tb values (12)"); // 插入数据
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在PHP里,如果你没有手写构造函数,则php在实例化这个对象的时候,会自动为类成员以及类方法进行初始化,分配内存等工作,但是有些时候不能满足我们的要求,比如我们要在对象实例化的时候传递参数,那么就需要手动编写构造函数了,手写构造函数有两种写法,只是表现形式不同,其实本质一样
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<html>
<head>
<title></title>
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