任务：

定义如下类
People
属性： name (string nonstatic) age (int nonstatic) height (double nonstatic) weight (duoble nonstatic) hobby (array nonstatic) currentNumer (int static) MAXNUMBER (const)
⽅法 speak eat haveBirthday sleep walk swim run
要求：在⼀个对象创建和消亡时在控制台输出相应消息吃饭后体重会增加睡觉后⾝⾼会增加跑步、游泳会降低体重过⽣⽇会长⼀岁每个⽅法被执⾏的时候都需要调⽤speak⽅法，输出当前调⽤的⽅法的名字每当⼀个新的对象被创建，currentNumber需要发⽣变化，当总⼈数超过MAXNUMBER时提⽰创建失败。

反思

之前的任务完成时构造函数中出现了return，并且调用析构函数并不能完全销毁对象，所以进行改进，增加了set.php进行对象创建控制，People.php中定义了类People，set.php中定义了set函数用于创建对象，main.php实现具体功能.

People.php

<?php
namespace MyProject;
class People
{
    private $name;
    private $age;
    private $height;
    private $weight;
    private $hobby;
    public static $currentNumber = 0;
    const MAXNUMBER = 2;
    /**
     * People constructor.
     * @param string $name
     * @param int $age
     */
    public function __construct(string $name, int $age, $height, $weight,  array$hobby)
    {
        $this->name = $name;
        $this->age = $age;
        $this->height = $height;
        $this->weight= $weight;
        $this->hobby= $hobby;
        self::$currentNumber++ ;
       echo "current people number " .self::$currentNumber."</br>\n";
       echo "the person's name  is $this->name,</br> 
       the age is  $this->age years old,</br> 
       the height is  $this->height,</br>
       the weight is  $this->weight,</br>
       the hobby is </br>\n";
       var_dump($hobby);
       echo "</br>\n";
    }
    public function speak($action){
        echo "the method is $action  ";
        echo "     &nbsp&nbsp&nbsp&nbsp     ";
    }
    public function eat(){
        $this->speak(__METHOD__ );
        $this->weight=$this->weight+1;
        echo "current weight is ".$this->weight."</br>\n";
    }
    public function sleep(){
        $this->speak(__METHOD__ );
        $this->height=$this->height+1;
        echo "current height is ".$this->height."</br>\n";
    }
    public function run(){
        $this->speak(__METHOD__ );
        $this->weight=$this->weight-1;
        echo "current weight is ".$this->weight."</br>\n";
    }
    public function swim(){
        $this->speak(__METHOD__ );
        $this->weight=$this->weight-1;
        echo "current weight is ".$this->weight."</br>\n";
    }
    public function haveBirthday(){
        $this->speak(__METHOD__ );
        $this->age=$this->age+1;
        echo "current age is ".$this->age."</br>\n";
    }
    public function __destruct(){
        echo "destruct of " . __CLASS__ . " " . __METHOD__ . "</br>\n";
    }
}?>

set.php

<?php
namespace task2\file1;
require "People.php";
//use MyProject;
use  MyProject\People ;
function set(string $name, int $age, $height, $weight, array $hobby)
{
    if (People::$currentNumber+1> People::MAXNUMBER) {
        echo "construct fails        ";
        echo "&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp    ";
        echo "</br>\n";
        echo "</br>\n";
        return null;
    }
    else
        {
        $person =new People($name,  $age, $height, $weight,  $hobby);
        return $person;
        }
}
?>

main.php

<?php
require "set.php";
use function task2\file1\set as set;
$hooby = array(
    0=>"play basketball",
    1 => "play football",);
$people = set("ieso1",22,170,110,$hooby);
if(!empty($people)) {
 $people->haveBirthday();
 $people->eat();
 $people->sleep();
 $people->swim();
 $people->run();}
echo "</br>\n";
$people1 = set("ieso2",23,180,120,$hooby);
echo "</br>\n";
$people2 = set("ieso3",24,185,130,$hooby);
if(!empty($people2))
{
    $people2->eat();
}
$people3 = set("ieso3",24,185,130,$hooby);
if(!empty($people3))
{
    $people3->eat();
}
?>