<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<?php
class Mysql_1{
private $localhost,$name,$password,$database,$time_1;
public function __construct(){
$this->localhost="localhost";
$this->name="root";
$this->password="root";
$this->database="test";
$this->time_1=date("Y-m-d H:i:s");
}
public function connect(){
@mysql_connect($this->localhost,$this->name,$this->password,$this->database) or die("数据库连接失败!");
@mysql_select_db($this->database) or die("选择数据库失败!");
mysql_query("set names utf8");
}
public function getTime_1(){
return $this->time_1;
}
}
class Mysql_2 extends Mysql_1{
private $time_2;
public function setTime_2(){
$this->time_2=date("Y-m-d H:i:s");
}
public function getTime_2(){
return $this->time_2;
}
public function getTime_1(){
return parent::getTime_1();
}
}
$mysql_1=new Mysql_1();
echo "time_1: ".$mysql_1->getTime_1()."<br>";
$mysql_2=new Mysql_2();
echo "setTime_2! ".$mysql_2->setTime_2()."<br>";
echo "time_2: ".$mysql_2->getTime_2()."<br>";
echo "time_1: ".$mysql_2->getTime_1()."<br>";
?>
</body>
</html>
本文主要讲类的继承当中的extends 和 parent。