php generator与iterator

class dummp implements Iterator{
	
	public $data =array(1,3,6,7,89,99);
	public $index=0;
	public function rewind(){
		$this->index =0 ;
	}
	
	public function valid(){		
		return isset($this->data[$this->index]);		
	}
	
	
	public function current(){		
		return $this->data[$this->index];
	}
	
	public function key(){		
		return $this->index;
	}
	
	public function next(){	
	echo 'run  ...next';	
			$this->data[$this->index  ] ?? $this->data[$this->index];
	}
}
foreach(new dummp() as $v){
	echo $v;
	echo "\n";
}

$data =array(1,3,6,7,89,99);
function generator($data){
	$i=0;
	while( $m=$data[$i  ] ){
		yield $m;
		echo 'run ..generator';
		if(!isset($data[$i])){
			break;	
		}
	}	
}
	echo "\n";
	echo "\n";
	echo "\n";
foreach(generator($data) as $v){
	echo $v;
	echo "\n";
}