数组相关操作：https://www.php.net/manual/zh/book.array.php

array_column($array,$string)返加数组中指定列的数量（返回一维数组）

$array=[['test'=>1],['test'=>2],['test'=>3],['test'=>4]];
$new_array=array_column($array,'test');// $new_array=[1,2,3,4]
var_dump($new_array);

array_flip($array)交换数组中的键与值

$array=['a','b','c'];
$new_array=array_flip($array);//$new_array=['a'=>0,'b'=>1,'c'=>2]
var_dump($new_array);

array_walk();array_walk_recursive();array_map();数组中的元素做处理

• https://www.php.net/manual/zh/function.array-walk.php
• https://www.php.net/manual/zh/function.array-walk-recursive.php
• https://www.php.net/manual/zh/function.array-map.php

array_filter();数组过滤

• https://www.php.net/manual/zh/function.array-filter.php