People.php

<?php
namespace  MyProject ;
 class People
{
  private $name ; // string
  private $age ; //int
  private $height ; //double
  private $weight ; // double
  private $hobby=array() ; //stringArray
  public static $currentNumber=0 ; //int
  const MAXNUMBER=100 ;

  public function __construct (  $name ,  $age ,  $height , $weight , array $hobby )
  {
      $this->name = $name ;
      $this->age  = $age ;
      $this->height = $height ;
      $this->weight = $weight ;
      $this->hobby = $hobby ;
      self::$currentNumber++ ;
      echo "A person has been constructed<br>" ;
      if( self::$currentNumber >= self::MAXNUMBER )
      {
        echo "There are too much person<br>" ;
        $this->__destruct() ;
      }

  }
  public function __destruct()
  {
    echo "A person has been destructed\n" ;
    self::$currentNumber-- ;
    // TODO: Implement __destruct() method.
  }

     public function speak( $what )
  {
    echo $what."<br>" ;
  }
  public function eat()
  {
    $this->speak(__METHOD__) ;
    $this->weight+=0.5 ;
  }
  public function sleep()
  {
    $this->speak(__METHOD__) ;
    $this->height+=0.1 ;
  }

  public function haveBirthday()
  {
    $this->speak(__METHOD__) ;
    $this->age++ ;
  }

  public function swim()
  {
    $this->speak(__METHOD__) ;
    $this->weight-=0.5 ;
  }

  public function run()
  {
     $this->speak(__METHOD__) ;
     $this->weight-=0.5 ;
  }

  public function walk()
  {
     $this->speak(__METHOD__) ;
  }
}
 
 // 以下是测试运行部分： 
 $a =  new People("Chengyi", 19 , 178 , 72 , array() ) ;
 $a -> eat() ;
 $a -> sleep() ;
 $a -> haveBirthday() ;
 $a -> run() ;
 $a -> walk() ;
 $a -> speak("I finished this task！") ; 
?>

运行结果

A person has been constructed
MyProject\People::eat
MyProject\People::sleep
MyProject\People::haveBirthday
MyProject\People::run
MyProject\People::walk
I finished this task！
A person has been destructed