[英]How do I sort a multidimensional array with stdClass Objects by values of a key?
Yes, I have searched and tried many techniques, but nothing seems to work. 是的,我已经搜索并尝试了许多技术,但似乎没有任何工作。 Here is my array: 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
)
)
I basically want to sort this by the name key, but every function I've tried on Stackoverflow doesn't seem to work, as in, I get a blank page with no error. 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。
I tried this: 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');
But that didn't work. 但那没用。
Any ideas? 有任何想法吗?
You're almost right, but $row[$col]
tries to access the objects like an array. 你几乎是对的,但$row[$col]
尝试像数组一样访问对象。 You want something like $row->{$col}
instead. 你需要像$row->{$col}
这样的东西。 Here's a simpler, working example: 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);
Outputs: 输出:
Array
(
[0] => stdClass Object
(
[name] => Business1
)
[1] => stdClass Object
(
[name] => Business2
)
[2] => stdClass Object
(
[name] => Business3
)
)
usort($array, function($a, $b) {
return strcmp($a->name, $b->name);
});
You should use usort ... 你应该使用usort ...
So you define a function that compares two objects (by the name field) and then run usort on the array, passing in the function as the second argument. 因此,您定义一个比较两个对象的函数(通过名称字段),然后在数组上运行usort,将函数作为第二个参数传递。
Something like this: 像这样的东西:
function cmp($a, $b)
{
if ($a["name"] == $b["name"]) {
return 0;
}
return ($a["name"] < $b["name"]) ? -1 : 1;
}
usort ($my_array, "cmp");
var_dump($my_array);
Hope that helps! 希望有所帮助!
Ben 本
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