<?php $c = ['t1' => null, 't2' => 2]; $a= isset($c['t1']); isset($c['t11']) & var_dump('test'); var_dump(isset($sdad)); 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(); ?>
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