php increment a number in static constructor -

i need increment number in constructor of class, without calling static functions. code follows:

class addup {  static public $num;  function __construct($num) {   echo 'my number is==>' . $num;   static::$num++;   } }  $inc = new addup();//instantiated object echo '<br>'; echo $inc::$num;//should 2, still 1, should $inc = new     addup() or $inc->addup() implemented in class? echo '<br>'; echo $inc::$num;//should 3, still 1 echo '<br>'; echo $inc::$num;//should 4, still 1 

any ideas welcome, thank you

upd made following refactoring:

$inc = new increment();//my number is==>2 echo '<br>'; $inc = new increment();//my number is==>3 echo '<br>'; $inc = new increment();//my number is==>4 echo '<br>'; $inc = new increment();//my number is==>5 

is way without calls functions in class?

a static property means value of static property same across multiple instantiations of class.

this may demonstrate whats happening code better example

side note: parameter passing had no effect on , doing nothing

<?php class addup {      static public $num;      function __construct() {         static::$num++;     } }  $inc1 = new addup();   // calls constructor therefore +1 echo php_eol; echo $inc1::$num; // 1  $inc2 = new addup();   // calls constructor therefore +1 echo php_eol; echo $inc2::$num; // 2  $inc3 = new addup();   // calls constructor therefore +1 echo php_eol; echo $inc3::$num; // 3  // if @ $inc1::$num; after instantiating inc2 , inc3 echo php_eol; echo $inc1::$num; // not 1 whatever last incremented i.e. 3