从其他2个数组创建一个数组

Question

$arrayA = Array ( 
                 [0] => 1, 
                 [1] => 2, 
                 [2] => 4 
                )

$arrayB = Array ( 
                 [1] => Dog, 
                 [2] => Cat, 
                 [3] => Cow, 
                 [4] => Duck 
                )

如何创建一个$arrayC从上述2个数组中取值的值:

$arrayC = Array ( 
                 [1] => Dog, 
                 [2] => Cat, 
                 [4] => Duck 
                )

从理论上讲,它是这样的:

$arrayC = Array ( 
                 [$arrayA[0]] => $arrayB[$arrayA[0]],
                 [$arrayA[1]] => $arrayB[$arrayA[1]],
                 [$arrayA[2]] => $arrayB[$arrayA[2]]
                )

谢谢.

Answer 1

您可以在没有foreach(演示)的情况下以优雅的方式执行此操作:

$arrayC = array_intersect_key($arrayB, array_flip($arrayA));

见array_intersect_key^[文档]和array_flip^[文档]