类的定义和实例化

<?php

class NbaPlayer
{
    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";
    }

}

$jordan = new NbaPlayer();
echo $jordan->name;
$jordan->run();
?>

构造函数

<?php
//peoples republic of china
date_default_timezone_set("PRC");

class NbaPlayer
{
    public $name = "Jordan";
    public $height = "198cm";
    public $weight = "98kg";
    public $team = "Bull";
    public $playerNumber = "23";

    function __construct($name, $height)
    {
        $this->name = $name;//this 伪变量
        $this->height = $height;
    }

    //定义方法
    public function run()
    {
        echo "Running\n";
    }

    public function shoot()
    {
        echo "shooting\n";
    }
}

$jordan = new NbaPlayer('hehe', '220cm');
echo $jordan->name;
$jordan->run();
?>

析构函数

<?php
//peoples republic of china
date_default_timezone_set("PRC");

class NbaPlayer
{
    public $name = "Jordan";
    public $height = "198cm";
    public $weight = "98kg";
    public $team = "Bull";
    public $playerNumber = "23";

    function __construct($name, $height)
    {
        $this->name = $name;//this 伪变量
        $this->height = $height;
    }

    //定义方法
    public function run()
    {
        echo "Running\n";
    }

    //在该方法中释放资源
    function __destruct()
    {
        echo "destroying" . $this->name . "\n";
    }
}

$jordan = new NbaPlayer('hehe', '220cm');
echo $jordan->name;
$jordan->run();
$jordan = null;//主动调用析构函数 不调用该方法会执行From now on再析构
echo "From now on jordan will not be used.\n";
?>

$jordan = new NbaPlayer('hehe', '220cm');
echo $jordan->name."<br/>";
//$jordan->run();
$jordan = null;//主动调用析构函数 不调用该方法会执行From now on再析构
echo "From now on jordan will not be used.";

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对象不再被使用才会触发析构函数

$jordan = new NbaPlayer('hehe', '220cm');
echo $jordan->name."<br/>";
$jordan1=$jordan;
$jordan = null;//主动调用析构函数 不调用该方法会执行From now on再析构
echo "From now on jordan will not be used."."<br/>";

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$jordan = new NbaPlayer('hehe', '220cm');
echo $jordan->name."<br/>";
$jordan1=&$jordan;
$jordan = null;//主动调用析构函数 不调用该方法会执行From now on再析构
echo "From now on jordan will not be used."."<br/>";

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$jordan = new NbaPlayer('hehe', '220cm');
echo $jordan->name."<br/>";
$jordan1=$jordan;
$jordan2=&$jordan;
$jordan1 = null;//主动调用析构函数 不调用该方法会执行From now on再析构
$jordan2=null;
echo "From now on jordan will not be used."."<br/>";

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