php ob_flush

PHP:flush跟ob_flush

class Number {

 public $number;
 
 public function __construct() {
 
  $this->number = rand(1,10);!

  echo $this->number; 

  echo "
";

  ob_flush(); //output_buffer
 
  flush();
  
  sleep(2);
  
  unset($this); //destruct 
 
 }
 
//recreat object when each time destruct 
 public function __destruct() {
  
     $number = new Number;
 
 }
 
} 

$number = new Number;