$arr=array(
'a'=>array('1.1'=>1,'1.2'=>2,'1.3'=>3),
'b'=>array('2.1'=>11,'2.2'=>22,'2.3'=>33),
'c'=>array('3.1'=>111,'3.2'=>222,'3.3'=>333),
'd'=>array('4.1'=>1111,'4.2'=>2222,'4.3'=>3333),
'e'=>array('5.1'=>11111,'5.2'=>22222,'5.3'=>33333)
);//可以用foreach就用foreach吧!!!!!!!!!!!!!