实例化php类时传参的方法分析

<?php
    class person{
        var $name;
        var $color;
        var $sex;
        var $age;
        function __construct($name,$age='',$sex='boy'){
            $this->name = $name;
            $this->age = $age;
            $this->sex = $sex;
            $this->color = 'yello';
        }
        function eat(){
            echo $this->name.'要吃饭';
        }
        function xinxi(){
            echo $this->name.' is '.$this->sex.' and age is '.$this->age.' fuse is '.$this->color;
        }
        function zuoyong(){
          //类似于这样的内部调用，相当于把eat()的代码引入到zuoyong()里面，而不是跳转到eat()里面继续执行
            //如果是http://localhost/zuoyong?food=xigua这样的url来调用zuoyong()
            //那么eat()中可直接通过$_GET['food']获取url参数，因为全局变量可在函数内部使用
            $this->eat();
        }
    }
?>

<?php
    include('person.class.php');
    $son = new person('cuihua',25,'girl');//此处的参数传递要和类的构造方法里面的参数顺序对应
    //$son->xinxi();//cuihua is girl and age is 25 fuse is yello
    $son->name = '田妞';
    $son->eat();//田妞要吃饭
?>

<?php
    include('person.class.php');
    $son = new person('cuihua',25,'girl');
    $son2 = $son;
    $son2->name = '田妞';
    $son->eat();//田妞要吃饭
?>

<?php
$son = new person('cuihua',25,'girl');
var_dump($son);
/*
object(person)[1]
 public 'name' => string 'cuihua' (length=6)
 public 'color' => string 'yello' (length=5)
 public 'sex' => string 'girl' (length=4)
 public 'age' => int 25
*/
 
$mon = get_class_methods($son);
var_dump($mon);
/*
array (size=4)
 0 => string '__construct' (length=11)
 1 => string 'eat' (length=3)
 2 => string 'xinxi' (length=5)
 3 => string 'zuoyong' (length=7)
*/
?>