PHP array_column()

array array_column ( array $input , mixed $column_key [, mixed $index_key = null ] )

array_column — 返回数组中指定的一列 array_column() 返回input数组中键值为column_key的列， 如果指定了可选参数index_key，那么input数组中的这一列的值将作为返回数组中对应值的键。

$items = array(
    [
        "uid"=>1,
        "pid"=>0,
        "views"=>100
    ],
    [
        "uid"=>2,
        "pid"=>1,
        "views"=>200
    ],
    [
        "uid"=>3,
        "pid"=>0,
        "views"=>300
    ],
    [
        "uid"=>4,
        "pid"=>0,
        "views"=>400
    ],
    [
        "uid"=>5,
        "pid"=>3,
        "views"=>500
    ]
);

array_column($items,'uid');[1,2,3,4,5];
array_column($items,'uid','view');//[100=>1,200=>2,300=>3,400=>4,500=>5];