[英]Sorting multidimensional array by key alphabetically
Trying to sort by this multidimensional array by screen name: 尝试按屏幕名称按此多维数组排序:
//Looping through this for each member of a group
unset($member_info);
$member_info->id = $member->id;
$member_info->screen_name = $member->screen_name;
$member_info->first_name = $member->first_name;
$member_info->last_name = $member->last_name;
$member_info->email = $member->email;
//Sort member_info by screen name
$member_array = sort_by_array_key($member_info,$member_info->screen_name,'ASC');
$member_list[] = $member_array;
Sort function: 排序功能:
function sort_by_array_key($array,$sort_key,$dir = 'ASC') {
usort($array, function($a,$b) use ($sort_key){
return strnatcasecmp($a["$sort_key"], $b["$sort_key"]);
});
if ( $dir == 'DESC' ) { return array_reverse($array); }
else { return $array; }
}
As an example, screen names are currently in this order even after I run the sort function: 例如,即使我运行了sort函数,屏幕名称当前仍是按此顺序排列的:
newUser
Chris
Carlos
Jason
I am probably applying the sort at the wrong time but after looking at other similar examples here I was having trouble with this, any help is appreciated, thanks! 我可能在错误的时间应用了排序,但是在查看了其他类似示例后,我对此感到很麻烦,我们将不胜感激,谢谢!
First of all, you're sorting an individual item there, where you probably want to sort the actual list, $member_list. 首先,您要在此处对单个项目进行排序,您可能希望在其中对实际列表$ member_list进行排序。 Also, you're trying to sort an array where you initialize an object.
另外,您正在尝试对要初始化对象的数组进行排序。 Either initialize an array or sort an object.
初始化数组或对对象进行排序。
If I assume you really want to play with arrays, like you imply on the subject, this might be something you're trying to do: 如果我假设您真的想使用数组,就像您暗示这个主题一样,那么您可能正在尝试这样做:
<?php
$member_info = Array();
$member_info['id'] = '1';
$member_info['screen_name'] = 'Chris';
$member_info['first_name'] = '';
$member_info['last_name'] = '';
$member_info['email'] = '';
$member_list[] = $member_info;
$member_info = Array();
$member_info['id'] = '2';
$member_info['screen_name'] = 'Carlos';
$member_info['first_name'] = '';
$member_info['last_name'] = '';
$member_info['email'] = '';
$member_list[] = $member_info;
$member_info = Array();
$member_info['id'] = '3';
$member_info['screen_name'] = 'Jason';
$member_info['first_name'] = '';
$member_info['last_name'] = '';
$member_info['email'] = '';
$member_list[] = $member_info;
//Sort member_list by screen name
$member_list = sort_by_array_key($member_list,'screen_name','ASC');
function sort_by_array_key($array,$sort_key,$dir = 'ASC') {
usort($array, function($a,$b) use ($sort_key){
return strnatcasecmp($a["$sort_key"], $b["$sort_key"]);
});
if ( $dir == 'DESC' ) { return array_reverse($array); }
else { return $array; }
}
print_r($member_list);
/*
Array
(
[0] => Array
(
[id] => 2
[screen_name] => Carlos
[first_name] =>
[last_name] =>
[email] =>
)
[1] => Array
(
[id] => 1
[screen_name] => Chris
[first_name] =>
[last_name] =>
[email] =>
)
[2] => Array
(
[id] => 3
[screen_name] => Jason
[first_name] =>
[last_name] =>
[email] =>
)
)
*/
ksort - "Sorts an array by key, maintaining key to data correlations. This is useful mainly for associative arrays." ksort-“按键对数组进行排序,并保持数据关联的键。这主要用于关联数组。”
See the manual 见手册
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