I downloaded Netbeans nightly release and beta6.5 full version, and it testing on my  webproject.
Auto code completion didnt work it :(
See this example code :

<?php
 class Class2
        {
            /**
             *
             * @var Class1
             */
            private $t1;

            /**
             *
             * @return Class1
             */
            public function getT1()
            {
                return $this->t1;
            }

            /**
             *
             * @param Class1 $v 
             */
            public function setT1($v)
            {
                $this->t1 = $v;
            }

            public function __construct()
            {
                
            }
        }

        class Class1
        {
            /**
             *
             * @var Class2
             */
            private $t2;

            /**
             *
             * @return Class2
             */
            public function getT2()
            {
                return $this->t2;
            }

            
            public function __construct()
            {
                $this->t2 = new Class2();

                $this->t2-> //auto code completion dont work setT1($this);
                //with eclipse pdt this was working perfect
                $this->getT2()->getT1()->getT2()->getT1()->getT2()->setT1(new Class1());
                
                
                
            }
        }
?>