Sort multi-dimensional array by specific key
I have an array:
Array (
[0] => stdClass Object (
[user_id] => 1
[ID] => 1
[user_login] => admin
[display_name] => admin
[user_email] => webbinformation@nacka.se
[meta_value] => a:1:{s:13:\"administrator\";s:1:\"1\";}
)
[1] => stdClass Object (
[user_id] => 4
[ID] => 4
[user_login] 开发者_运维百科=> ungtinflytande
[display_name] => ungtinflytande
[user_email] => klarakviberg@gmail.com
[meta_value] => a:1:{s:13:\"administrator\";s:1:\"1\";}
)
[2] => stdClass Object (
[user_id] => 5
[ID] => 5
[user_login] => inflytandepilot
[display_name] => inflytandepilot
[user_email] => hildalundgren@hotmail.com
[meta_value] => a:1:{s:6:\"author\";s:1:\"1\";}
)
[3] => stdClass Object (
[user_id] => 11
[ID] => 11
[user_login] => matsbohman
[display_name] => matsbohman
[user_email] => mats.bohman@nacka.se
[meta_value] => a:1:{s:6:\"editor\";s:1:\"1\";}
)
[4] => stdClass Object (
[user_id] => 12
[ID] => 12
[user_login] => klarakviberg
[display_name] => klarakviberg
[user_email] => nastasteg@nacka.se
[meta_value] => a:1:{s:13:\"administrator\";s:1:\"1\";}
)
)
...that I wanna sort by the display_name
key. I currently print it like this:
foreach ($blogusers as $bloguser) {
...
}
How do I do this?
You would use usort() - http://php.net/usort
My suggestion would be:
function cmp($a, $b)
{
return strcmp($a->display_name, $b->display_name);
}
usort($blogusers, "cmp");
foreach ($blogusers as $bloguser)
{
...
See usort: http://php.net/manual/en/function.usort.php
usort($array, "my_cmp");
function my_cmp($a, $b) {
if ($a->display_name == $b->display_name) {
return 0;
}
return ($a->display_name < $b->display_name) ? -1 : 1;
}
I have find answer at https://joshtronic.com/2013/09/23/sorting-associative-array-specific-key/
function sortBy($field, &$array, $direction = 'asc')
{
usort($array, create_function('$a, $b', '
$a = $a["' . $field . '"];
$b = $b["' . $field . '"];
if ($a == $b)
{
return 0;
}
return ($a ' . ($direction == 'desc' ? '>' : '<') .' $b) ? -1 : 1;
'));
return true;
}
And now call this function by specific array key.
$newArray = sortBy('display_name', $blogusers);
And if sort in asc/desc just add one argument,
sortBy('display_name', $blogusers, 'desc');
Your array looks like the result of a database query. If this is a case, let the database do the sorting: just append ORDER BY display_name
to the query.
Take a look at following article. It does describe how to use usort()
and also describes how to use create_function()
so that you can use single function to sort on different fields (with required direction asc
or desc
).
http://phpave.com/sorting-associative-array-specific-key/
In case you are stuck with error or your array doesn't sort you can give this a try as this works for me-
usort($blogusers,function ($a, $b)
{
return strcmp($a["display_name"], $b["display_name"]);
});
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