数组有关问题求大侠给个方法

数组问题 求大侠给个方法
$a = Array
(
[0] => 3
[1] => 1
[2] => 2
[3] => 7
)

$b = Array
(
[1] => Emross War
[2] => Roman Empire
[3] => Avalon Wars
[7] => 掌上三国
[9] => 罗马（91）
[10] => Space Dominions
[11] => 腾讯三国
[12] => Vampire War
[15] => 三国英雄传
[17] => 掌上水浒
)
$a数组中的值是$b 的键值

那我如何得到
$c = Array
(
[1] => Emross War
[2] => Roman Empire
[3] => Avalon Wars
[7] => 掌上三国
)

求大侠给个答案
php 数组

------解决方案--------------------

$a = Array

(

    0 => 3,

    1 => 1,

    2 => 2,

    3 => 7

);



$b = Array

(

    1 => 'Emross War',

    2 => 'Roman Empire',

    3 => 'Avalon Wars',

    7 => '掌上三国',

    9 => '罗马（91）',

    10 =>'Space Dominions',

    11 =>'腾讯三国',

    12 =>'Vampire War',

    15 =>'三国英雄传',

    17 =>'掌上水浒'

);

foreach($a as $k){

     $c[$k]=$b[$k];

}

ksort($c);

print_r($c);

------解决方案--------------------

sort($a); // 将数组 $a 按值升序排列

$c = array(); //定义一个结果数组

foreach($a as $k) { // 依次从数组 $b 中取值

  $c[$k] = $b[$k];

}

------解决方案--------------------

$a = Array

(

    '0' => 3,

    '1' => 1,

    '2' => 2,

    '3' => 7

);



$b = Array

(

    '1' => 'Emross War',

    '2' => 'Roman Empire',

    '3' => 'Avalon Wars',

    '7' => '掌上三国',

    '9' => '罗马（91）',

    '10' => 'Space Dominions',

    '11' => '腾讯三国',

    '12' => 'Vampire War',

    '15' => '三国英雄传',

    '17' => '掌上水浒',

);

$c = array_flip($a);				//array_flip -- 交换数组中的键和值