PHP数组相关函数的使用

array_map

array_map — 为数组的每个元素应用回调函数
应用场景：循环遍历数组，并赋值给其他变量

$oriList = 
Array
(
    [0] => Array
        (
            [id] => 3182
            [name] => aaaa6
            [companyId] => 839
        )

    [1] => Array
        (
            [id] => 3183
            [name] => aaaa3
            [companyId] => 839
        )
)


$retArr = [];
$count = 0;
array_map(function ($row) use (&$retArr, &$count) {
    $retArr[] = ['id' => $row['id'], 'name' => $row['name']];
    $count++;
}, $oriList);

只提取出id和name字段
$retArr
Array
(
    [0] => Array
        (
            [id] => 3182
            [name] => aaaa6
        )

    [1] => Array
        (
            [id] => 3183
            [name] => aaaa3
        )
)