关于php:php数组

1.array_map

$arr = ['lanting','nanfeng','xuehua','xiao'];$result = array_map(function($item){ return strtoupper($item);},$arr);$info = array_keys($data);$data = array_flip($info);$result =  array_map(function ($item) {    return $item + 1;}, $data);$arr1=array(1,3,5,7);$arr2=array(2,4,6,8,9);$results=array_map(function($a,$b){    return $a*$b;},$arr1,$arr2);