<?php
function gen_one_to_three() {
for ($i = 1; $i <= 3; $i++) {
// Note that $i is preserved between yields.
yield $i;
}
}
$generator = gen_one_to_three();
var_dump($generator);
die;
abstract class T
{
static public $instanses;
final private function __construct(){
}
public static function getInstance()
{
if (!(static::$instanses instanceof static)) {
static::$instanses = new static;
}
return static::$instanses;
}
}
class A extends T
{
static public $instanses;
}
class B extends A
{
static public $instanses;
}
$t = A::getInstance();
var_dump($t);
$t1 = B::getInstance();
var_dump($t1);
new B();
?>