PHP constructor and destructor analysis

 class counter
 {
 private static $count = 0;
 function __construct()
 {
 self::$count++;
 }
 function __destruct()
 {
 self::$count--;
 }
 function getcount()
 {
 return self:: $count;
 }
 }
 //Create the first instance
 $c = new counter();
 //Output 1
 print( $c->getcount() . "
n");
 //Create a second instance
 $c2 = new counter();
 print($c->getcount() . "
n");
 //Destroy the instance
 $c2 = null;
< ;p> //Output 1
 print($c->getcount() . "
n");
?＞

Note: When a new instance is created, memory is prepared to store all properties. Each instance has its own unique set of properties. But methods are shared by all instances of the class.