我對PHP很陌生。我理解OOP的概念,但在語法上,我不知道如何從另一個文件擴展父類。這裏是我的代碼:PHP:從另一個文件調用父類
parent.php
<?php
namespace Animals;
class Animal{
protected $name;
protected $sound;
public static $number_of_animals = 0;
protected $id;
public $favorite_food;
function getName(){
return $this->name;
}
function __construct(){
$this->id = rand(100, 1000000);
Animal::$number_of_animals ++;
}
public function __destruct(){
}
function __get($name){
return $this->$name;
}
function __set($name, $value){
switch($name){
case 'name' :
$this->$name = $value;
break;
case 'sound' :
$this->$name = $value;
break;
case 'id' :
$this->$name = $value;
break;
default :
echo $name . " not found";
}
}
function run(){
echo $this->name . ' runs <br />';
}
}
?>
擴展classes.php
<?php
namespace mammals;
include 'parent.php';
use Animals\Animal as Animal;
class Cheetah extends Animal{
function __construct(){
parent:: __construct();
}
}
?>
main.php
<?php
include 'extended-classes.php';
include 'parent.php';
use Animals\Animal as Animal;
use mammals\Cheetah as Cheetah;
$cheetah_one = new Cheetah();
$cheetah_one->name = 'Blur';
echo "Hello! My name is " . $cheetah_one->getName();
?>
我使用MAMP運行代碼,並且出現以下錯誤:Cannot declare class Animals\Animal, because the name is already in use in /path/to/file/parent.php on line 4
。所有提示都表示讚賞。
你應該使用'include_once的()',而不是僅僅'包括()',以確保您的文件只包含一次。 –