<?php
class human{
  public static $leg=2;
  public $name = 'leo';
  public $age = '25';
  public function cry(){
  }
}
$leo = new human();
print_r($leo);
/*返回
human Object ( [name] => leo [age] => 25 )
*/
//為什么沒(méi)有l(wèi)eg呢？
//是因?yàn)榧恿藄tatic，就變成了類的屬性了，是屬于所有
//通過(guò)這個(gè)類實(shí)例實(shí)例后的對(duì)象的
//public是權(quán)限修飾符，權(quán)限修飾符有public,protected,private
//在PHP4經(jīng)常用到var，這個(gè)現(xiàn)在不怎么也不推薦用，就相當(dāng)于public
//在PHP5中會(huì)把var解析成public
?>

<?php 
class human{
  public static $leg=2;
  public $name = 'leo';
  public $age = '25';
  public function __construct($name,$age){
    $this->name=$name;
    $this->age=$age;
  }
}
$leo = new human('macro','23');
print_r($leo);
/*
返回
human Object ( [name] => macro [age] => 23 )
可以看到參數(shù)起作用了
__construct就是構(gòu)造函數(shù)
*/
?>

<?php 
class human{
  public static $leg=2;
  public $name = 'leo';
  public $age = '25';
  public function __construct($name,$age){
    $this->name=$name;
    $this->age=$age;
    echo $this->name."對(duì)象生成啦<br />";
  }
  public function __destruct(){
    echo $this->name."對(duì)象銷毀啦<br />";
  }
}
$leo = new human('macro','23');
$tim = new human('tim','18');
unset($leo);
echo '~~~~~~~~~~~~~~~~~~~~<br />';
/*
返回：
macro對(duì)象生成啦
tim對(duì)象生成啦
macro對(duì)象銷毀啦
~~~~~~~~~~~~~~~~~~~~
tim對(duì)象銷毀啦
*/
//__destruct是析構(gòu)函數(shù)，即對(duì)象銷毀的時(shí)候調(diào)用
//為什么$tim 沒(méi)有unset 也執(zhí)行了析構(gòu)函數(shù)
//這是一個(gè)隱式銷毀，unset是顯式銷毀
//當(dāng)一個(gè)頁(yè)面執(zhí)行完成自動(dòng)銷毀
?>