如何使用键的值对stdClass对象排序多维数组？

Question

是的,我已经搜索并尝试了许多技术,但似乎没有任何工作.这是我的数组:

Array
(
    [0] => stdClass Object
        (
            [id] => 119
            [name] => Business3
            [start_date] => 1338789600
            [end_date] => 1354604400
        )

    [1] => stdClass Object
        (
            [id] => 153
            [name] => Business1
            [start_date] => 1338962400
            [end_date] => 1370498400
        )

    [2] => stdClass Object
        (
            [id] => 135
            [name] => Business2  
            [start_date] => 1339653600
            [end_date] => 1356937200
        )
)

我基本上想要通过名称键对它进行排序,但我在Stackoverflow上尝试的每个函数似乎都不起作用,因为我得到一个没有错误的空白页面.

我试过这个:

function array_sort_by_column(&$arr, $col, $dir = SORT_ASC) {
    $sort_col = array();
    foreach ($arr as $key=> $row) {
        $sort_col[$key] = $row[$col];
    }

    array_multisort($sort_col, $dir, $arr);
}

array_sort_by_column(json_decode(json_encode($businesses), true), 'name');

但那没用.

有任何想法吗？

Answer 1

你几乎是对的,但$row[$col]试图像数组一样访问对象.你想要的是$row->{$col}相反的东西.这是一个更简单,有效的例子:

$db = array(
  0 => (object) array('name' => 'Business3'),
  1 => (object) array('name' => 'Business2'),
  2 => (object) array('name' => 'Business1')
);

$col  = 'name';
$sort = array();
foreach ($db as $i => $obj) {
  $sort[$i] = $obj->{$col};
}

$sorted_db = array_multisort($sort, SORT_ASC, $db);

print_r($db);

输出:

Array
(
    [0] => stdClass Object
        (
            [name] => Business1
        )

    [1] => stdClass Object
        (
            [name] => Business2
        )

    [2] => stdClass Object
        (
            [name] => Business3
        )

)

Answer 2

usort($array, function($a, $b) {
    return strcmp($a->name, $b->name);
});