php类和命名空间介绍，成员方法和类方法，类的继承与方法重写

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1. 类和命名空间的介绍

foo.php:

<?php

// require_once ‘lib.php‘;

// $h = new Hello(); //类的实例

// $h->sayHello(); //实例访问类的方法
s
// $d = new Desktop();
// $d-> work();

// require_once ‘Apple/foo.php‘;  //foo.php的文件位置

// $h = new \jkxy\Hello(); //foo.php的命名空间,在Hello类，namespace jkxy;
// $h->sayHello();

require_once ‘lib.php‘;
$m = new Man(10,‘iwen‘);
echo $m->getName();

lib.php:

<?php

// class Hello{

// public function sayHello(){
// echo ‘hello php‘;
// }
// }

// class Desktop{
// public function work(){
// echo ‘work‘;
// }
// }

2. 成员方法和类方法，类的继承和重写：People.php >> Man.php, foo.php调用Man.php，看看Man.php的继承属性和重写属性

foo.php:

<?php

// require_once ‘People.php‘;

// for($i=0;$i<10;$i++){
// $p = new People(10,‘iwen‘,‘man‘);
// echo $p->getName().‘ ‘;
// }

require_once ‘Man.php‘;

$m = new Man(10,‘iwen‘);
$m->hi();

 People.php:

<?php

class People{
/*
* @param int $age People‘s age
* @param string $name People‘s name
* @param string $sex People‘s sex
*/

public function __construct($age,$name,$sex){
//echo ‘Construct people‘;

$this->_age = $age;
$this->_name = $name;
$this->_sex = $sex;

People::$NUM++;

if(People::$NUM>People::MAX_PEOPLE_NUM){
throw new Exception("You can‘t create more people");
}
}

public function getAge(){
return $this->_age;
}
public function getName(){
return $this->_name;
}
public function getSex(){
return $this->_sex;
}

public function hi(){
echo $this->_name.‘ say hi‘;
}

private $_age,$_name,$_sex;

private static $NUM = 0;
const MAX_PEOPLE_NUM = 10;

public static function sayHello(){
echo ‘Hello People‘;
}
}

Man.php:

<?php

require_once ‘People.php‘;

class Man extends People{

public function __construct($age,$name){
parent::__construct($age,$name,‘man‘);
}

public function hi(){
// parent::hi();

echo ‘Man ‘.$this->getName().‘ say hi‘;
}
}

php类和命名空间介绍，成员方法和类方法，类的继承与方法重写

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原文地址：http://www.cnblogs.com/htmlphp/p/4842340.html