multi-dimensional array sorting in php - php

Question

$student_data = array(
array(
"id" => 1,
"student_name" => "Kasimir Clark",
"country" => "Chile"
),
array(
"id" => 2,
"student_name" => "Kyle Myers",
"country" => "Cook Islands"
),
array(
"id" => 3,
"student_name" => "Merrill Velez",
"country" => "Israel"
),
array(
"id" => 4,
"student_name" => "Kadeem Graham",
"country" => "Christmas Island"
),
);
usort($student_data, function($a, $b)
{
return $a["student_name"] - $b["student_name"];
});
I need to sort the multi-dimentional array in PHP. Is it possible to sort the country then by the name? I tried to achieve in usort but I can only sort by one condition such as either name or country.
I would like to achieve something like what MySQL database is doing.
Something like
SELECT * FROM STUDENT order by country,name
Thank you for your help.

Answer 1

Use array_multisort, I found an implementation in the comments.
function array_orderby()
{
$args = func_get_args();
$data = array_shift($args);
foreach ($args as $n => $field) {
if (is_string($field)) {
$tmp = array();
foreach ($data as $key => $row)
$tmp[$key] = $row[$field];
$args[$n] = $tmp;
}
}
$args[] = &$data;
call_user_func_array('array_multisort', $args);
return array_pop($args);
}
$student_data = array(
array(
"id" => 1,
"student_name" => "Kasimir Clark",
"country" => "Chile"
),
array(
"id" => 2,
"student_name" => "Kyle Myers",
"country" => "Cook Islands"
),
array(
"id" => 3,
"student_name" => "Merrill Velez",
"country" => "Israel"
),
array(
"id" => 4,
"student_name" => "Kadeem Graham",
"country" => "Christmas Island"
)
);
$sorted = array_orderby($student_data, 'country', SORT_ASC, 'student_name', SORT_ASC);
print_r($sorted);
This print:
Array
(
[0] => Array
(
[id] => 1
[student_name] => Kasimir Clark
[country] => Chile
)
[1] => Array
(
[id] => 4
[student_name] => Kadeem Graham
[country] => Christmas Island
)
[2] => Array
(
[id] => 2
[student_name] => Kyle Myers
[country] => Cook Islands
)
[3] => Array
(
[id] => 3
[student_name] => Merrill Velez
[country] => Israel
)
)