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Is it possible to get the current class instance from a static class method?
class C{

  function static getInstance(){
    // here
  }

}


$c = new c;
print_r(C::getInstance()); // should be $c

print_r($c::getInstance()); // should be $c

class C {

  private static $instance;

  public static function getInstance(){
    return self::$instance;
  }

  public function __construct() {
    self::$instance = $this;
  }
}

$c = new c;
print_r(C::getInstance()); // should be $c

class C
{
   private static $instance;

   public static function getInstance()
   {
     if (!is_null(self::$instance)) return self::$instance;
     self::$instance = new self;
     return self::$instance;
   }

   private function __construct()
   {
     // Whatever
   }
}

$c = new C; // This will not work since __construct() is private
$c1 = C::getInstance();
$c2 = C::getInstance();

echo ($c1 == $c2 ? 'yes' : 'no'); // yes

<?php
class CallableClass
{
    public function __invoke()
    {
        return this;
    }
}
$obj = new CallableClass;
var_dump($obj);