PHP合并数组，键值不变

$actionArr = EventModel::dictAction();$projectlist = $this->getRrojectList();$list = array();foreach( $actionArr as $key => $value ) {    $list[$key] = $value;}foreach( $projectlist as $key => $value ) {    $list[$key] = $value;}

//以下数组是不为空的
$arr=array(''=>''); count($arr)//1

$arr=array("","","");count($arr)//3  if(count($arr)>=1)