class foo {
    function bar( $b = 0 )
    {
        static $a = 0;
        if ( $b ) {
            $a=$b;
        }   
         echo $a;
    }
}

$faz = new foo;
$faz->bar(3);
$baz = new foo;
$baz->bar();
foo::bar();

//
// Outputs:
// $faz->bar(3); ==> 3
// $baz->bar();  ==> 3
// foo::bar();     ==> 3
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