PHP Object-Oriented Programming - Basic Practice DAY 2
Object-oriented practices in PHP Basic practices
Advanced practices
Special practices
Concept of class
Concept of instantiation
Constructor
Destructor
Data access
Object Concept of reference Concept of class 
<?php //类的定义以关键字class开始，后面跟着这个类的名称。类的命名通常每个单词的第一个字母大写。以中括号开始和结束
//定义NbaPlayer类
class NbaPlayer{
//定义属性
public $name="Jordan";
public $height="198cm";
public $weight="98kg";
public $team="Bull";
public $playerNumber="23";
//定义方法
public function run(){
echo "Running\n";
}
public function jump(){
echo "Jumping\n";
}
public function dribble(){
echo "Dribbling\n";
}
public function shoot(){
echo "Shooting\n";
}
public function dunk(){
echo "Dunking\n";
}
public function pass(){
echo "Passing\n";
}
}
//类到<strong>对象的实例化
//类的实例化为<strong>对象</strong>时使用关键字new，new之后紧跟这类的名称和一对括号
$jordan = new NbaPlayer();
//<strong>对象</strong>中的属性成员可以通过->符号来访问
echo $jordan->name."\n";
//<strong>对象</strong>中的成员方法可以通过->符号来访问
$jordan->dribble();
$jordan->pass();
?><br>Output:<br>Jordan </p>
<p>Dribbling </p>Passing <br>Constructor <pre name="code"><?php date_default_timezone_set("PRC");
//类的定义以关键字class开始，后面跟着这个类的名称。类的命名通常每个单词的第一个字母大写。以中括号开始和结束
//定义NbaPlayer类
class NbaPlayer{
//定义属性
public $name="Jordan";
public $height="198cm";
public $weight="98kg";
public $team="Bull";
public $playerNumber="23";
//构造函数，在<strong>对象被实例化的时候自动调用
function __construct($name,$height,$weight,$team,$playerNumber){ //没有被明确调用，但是也被调用了
echo "In NbaPlayer Constructor\n";
$this->name=$name; //$this是PHP里的伪变量，表示<strong>对象</strong>自身。可以通过$this->的方法访问<strong>对象</strong>的属性和方法
$this->height=$height;
$this->weight=$weight;
$this->team=$team;
$this->playerNumber=$playerNumber;
}
//定义方法
public function run(){
echo "Running\n";
}
public function jump(){
echo "Jumping\n";
}
public function dribble(){
echo "Dribbling\n";
}
public function shoot(){
echo "Shooting\n";
}
public function dunk(){
echo "Dunking\n";
}
public function pass(){
echo "Passing\n";
}
}
//类到<strong>对象</strong>的实例化
//类的实例化为<strong>对象</strong>时使用关键字new，new之后紧跟这类的名称和一对括号
$jordan = new NbaPlayer("Jordan","198cm","98kg","Bull","23");
//<strong>对象</strong>中的属性成员可以通过->符号来访问
echo $jordan->name."\n";
//<strong>对象</strong>中的成员方法可以通过->符号来访问
$jordan->dribble();
$jordan->pass();
//每一次用new实例化<strong>对象</strong>的时候，都会用类名后面的参数列比调用构造函数
$james= new NbaPlayer("James","203cm","120kg","Heat","6");
echo $james->name;
echo $james->height;
echo $james->weight;
echo $james->team;
echo $james->playerNumber;
?>
Output:
In NbaPlayer Constructor
Jordan
Dribbling
Passing
In NbaPlayer Constructor
James
203cm
120kg
Heat
6
Destructor
<?php date_default_timezone_set("PRC");
//类的定义以关键字class开始，后面跟着这个类的名称。类的命名通常每个单词的第一个字母大写。以中括号开始和结束
//定义NbaPlayer类
class NbaPlayer{
//定义属性
public $name="Jordan";
public $height="198cm";
public $weight="98kg";
public $team="Bull";
public $playerNumber="23";
//构造函数，在<strong>对象被实例化的时候自动调用
function __construct($name,$height,$weight,$team,$playerNumber){ //没有被明确调用，但是也被调用了
echo "In NbaPlayer Constructor\n";
$this->name=$name; //$this是PHP里的伪变量，表示<strong>对象</strong>自身。可以通过$this->的方法访问<strong>对象</strong>的属性和方法
$this->height=$height;
$this->weight=$weight;
$this->team=$team;
$this->playerNumber=$playerNumber;
}
//析构函数，在程序执行结束的时候会自动调用
//析构函数通常被用于清理程序使用的资源，比如程序使用了打印机，那么可以在析构函数里面释放打印机资源。
function __destruct(){
echo "Destroying ".$this->name."<br>";
}
//定义方法
public function run(){
echo "Running\n";
}
public function jump(){
echo "Jumping\n";
}
public function dribble(){
echo "Dribbling\n";
}
public function shoot(){
echo "Shooting\n";
}
public function dunk(){
echo "Dunking\n";
}
public function pass(){
echo "Passing\n";
}
}
//类到<strong>对象</strong>的实例化
//类的实例化为<strong>对象</strong>时使用关键字new，new之后紧跟这类的名称和一对括号
$jordan = new NbaPlayer("Jordan","198cm","98kg","Bull","23");
//<strong>对象</strong>中的属性成员可以通过->符号来访问
echo $jordan->name."\n";
//<strong>对象</strong>中的成员方法可以通过->符号来访问
$jordan->dribble();
$jordan->pass();
//每一次用new实例化<strong>对象</strong>的时候，都会用类名后面的参数列比调用构造函数
$james= new NbaPlayer("James","203cm","120kg","Heat","6");
echo $james->name;
//通过把变量设置为null，可以触发析构函数的调用
$james=null;
echo "From now on James will not be used. <br>";
?>
Output:In NbaPlayer Constructor
Jordan
DribblingPassing
In NbaPlayer Constructor
James
Destroying James
From now on James will not be used.
Destroying Jordan
Object
Basic concept of reference
ObjectReference assignment ://image.codes51.com/Article/image/20150919/20150919094753_5210.jpg" alt="PHP Object-oriented
Programming - Basic Practice DAY 2">James is an object
. 
<?php date_default_timezone_set("PRC");
//类的定义以关键字class开始，后面跟着这个类的名称。类的命名通常每个单词的第一个字母大写。以中括号开始和结束
//定义NbaPlayer类
class NbaPlayer{
//定义属性
public $name="Jordan";
public $height="198cm";
public $weight="98kg";
public $team="Bull";
public $playerNumber="23";
//构造函数，在<strong>对象被实例化的时候自动调用
function __construct($name,$height,$weight,$team,$playerNumber){ //没有被明确调用，但是也被调用了
echo "In NbaPlayer Constructor\n";
$this->name=$name; //$this是PHP里的伪变量，表示<strong>对象</strong>自身。可以通过$this->的方法访问<strong>对象</strong>的属性和方法
$this->height=$height;
$this->weight=$weight;
$this->team=$team;
$this->playerNumber=$playerNumber;
}
//析构函数，在程序执行结束的时候会自动调用
//析构函数通常被用于清理程序使用的资源，比如程序使用了打印机，那么可以在析构函数里面释放打印机资源。
function __destruct(){
echo "Destroying ".$this->name."<br>";
}
//定义方法
public function run(){
echo "Running\n";
}
public function jump(){
echo "Jumping\n";
}
public function dribble(){
echo "Dribbling\n";
}
public function shoot(){
echo "Shooting\n";
}
public function dunk(){
echo "Dunking\n";
}
public function pass(){
echo "Passing\n";
}
}
//类到<strong>对象</strong>的实例化
//类的实例化为<strong>对象</strong>时使用关键字new，new之后紧跟这类的名称和一对括号
$jordan = new NbaPlayer("Jordan","198cm","98kg","Bull","23");
//<strong>对象</strong>中的属性成员可以通过->符号来访问
echo $jordan->name."\n";
//<strong>对象</strong>中的成员方法可以通过->符号来访问
$jordan->dribble();
$jordan->pass();
//每一次用new实例化<strong>对象</strong>的时候，都会用类名后面的参数列比调用构造函数
$james= new NbaPlayer("James","203cm","120kg","Heat","6");
echo $james->name;
//通过把变量设置为null，可以触发析构函数的调用
//当<strong>对象</strong>不会再被使用的时候，会触发析构函数
//james1也是指向new NbaPlayer();
$james1=$james;
$james=null;
echo "From now on James will not be used. <br>";
?>Output:<strong>In NbaPlayer Constructor</strong>Jordan<strong>Dribbling</strong>Passing<br>In NbaPlayer Constructor</p>James<br>From now on James will not be used.<br>Destroying James<br>Destroying Jordan<br>Example two:<br><pre name="code"><?php date_default_timezone_set("PRC");
//类的定义以关键字class开始，后面跟着这个类的名称。类的命名通常每个单词的第一个字母大写。以中括号开始和结束
//定义NbaPlayer类
class NbaPlayer{
//定义属性
public $name="Jordan";
public $height="198cm";
public $weight="98kg";
public $team="Bull";
public $playerNumber="23";
//构造函数，在<strong>对象被实例化的时候自动调用
function __construct($name,$height,$weight,$team,$playerNumber){ //没有被明确调用，但是也被调用了
echo "In NbaPlayer Constructor\n";
$this->name=$name; //$this是PHP里的伪变量，表示<strong>对象</strong>自身。可以通过$this->的方法访问<strong>对象</strong>的属性和方法
$this->height=$height;
$this->weight=$weight;
$this->team=$team;
$this->playerNumber=$playerNumber;
}
//析构函数，在程序执行结束的时候会自动调用
//析构函数通常被用于清理程序使用的资源，比如程序使用了打印机，那么可以在析构函数里面释放打印机资源。
function __destruct(){
echo "Destroying ".$this->name."<br>";
}
//定义方法
public function run(){
echo "Running\n";
}
public function jump(){
echo "Jumping\n";
}
public function dribble(){
echo "Dribbling\n";
}
public function shoot(){
echo "Shooting\n";
}
public function dunk(){
echo "Dunking\n";
}
public function pass(){
echo "Passing\n";
}
}
//类到<strong>对象</strong>的实例化
//类的实例化为<strong>对象</strong>时使用关键字new，new之后紧跟这类的名称和一对括号
$jordan = new NbaPlayer("Jordan","198cm","98kg","Bull","23");
//<strong>对象</strong>中的属性成员可以通过->符号来访问
echo $jordan->name."\n";
//<strong>对象</strong>中的成员方法可以通过->符号来访问
$jordan->dribble();
$jordan->pass();
//每一次用new实例化<strong>对象</strong>的时候，都会用类名后面的参数列比调用构造函数
$james= new NbaPlayer("James","203cm","120kg","Heat","6");
echo $james->name;
//通过把变量设置为null，可以触发析构函数的调用
//当<strong>对象</strong>不会再被使用的时候，会触发析构函数
//james1也是指向new NbaPlayer();
$james1=$james; //$james1直接指向詹姆斯
$james2=&james; //$james2相当于$james的影子，指向$james, $james再指向詹姆斯
$james=null; //不需要再次设置$james2=null，因为他俩的效果是一样的
$james1=null; //任何一个赋值为null相当于删除了一个<strong>对象</strong>的引用
echo "From now on James will not be used. <br>";
?>
Output:
In NbaPlayer Constructor
Jordan
Dribbling
Passing
In NbaPlayer Constructor
James
Destroying James
From now on James will not be used.
Destroying Jordan
The above introduces PHP object-oriented programming - basic practice DAY 2, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.
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