举个栗子：

$arr = array( '175' => '金针菇' '100' => '银针菇' ); $arr2 = array( '65' => '白萝卜' '67' => '黑萝卜' '84' => '黄萝卜' '100' => '银针菇' '90' => '大萝卜' '175' => '金针菇' );

最后的效果是这样子滴：

$arr3 = array( '175' => '金针菇' '100' => '银针菇' '65' => '白萝卜' '67' => '黑萝卜' '84' => '黄萝卜' '90' => '大萝卜' );

请教，这样的算法该怎么实现？