$a=array('1'=>'one','2'=>'two','3'=>'three','4'=>'four','5'=>'five',....);$b=array(2,5,4,1,3,.....);//數(shù)組a的key順序$c=array('2'=>'two','5'=>'five','4'=>'four','1'=>'one','3'=>'three',....);如何將數(shù)組a按照數(shù)組b值中key的順序重新排序得到數(shù)組c？（可以不用循環(huán)么？）