HTMLPurifier_Zipper::fromArray PHP Method

    public static function fromArray($array)
    {
        $z = new self(array(), array_reverse($array));
        $t = $z->delete();
        // delete the "dummy hole"
        return array($z, $t);
    }

 public function testBasicNavigation()
 {
     list($z, $t) = HTMLPurifier_Zipper::fromArray(array(0, 1, 2, 3));
     $this->assertIdentical($t, 0);
     $t = $z->next($t);
     $this->assertIdentical($t, 1);
     $t = $z->prev($t);
     $this->assertIdentical($t, 0);
     $t = $z->advance($t, 2);
     $this->assertIdentical($t, 2);
     $t = $z->delete();
     $this->assertIdentical($t, 3);
     $z->insertBefore(4);
     $z->insertAfter(5);
     $this->assertIdentical($z->toArray($t), array(0, 1, 4, 3, 5));
     list($old, $t) = $z->splice($t, 2, array(6, 7));
     $this->assertIdentical($old, array(3, 5));
     $this->assertIdentical($t, 6);
     $this->assertIdentical($z->toArray($t), array(0, 1, 4, 6, 7));
 }