Static function singleton

gistfile1.php

---foo.php
Namespace mylib;
class Foo implements ArrayAccess
{
  public function _call()
  
}


--bar.php
use mylib\Foo;
function Foo()
{
    static $instance;
    if (!($instance instanceof Foo)) {
        $instance = new Foo();
    }
    return $instance;
}



--- syntax
Foo()['val']
Foo()->bar()