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1. 起因今天一個學生問的對二維數組排序的問題。 例如： 當年齡相同時，再按照身高逆序排序。
$datas = [
['age' => 67, 'height' => 2],
['age' => 86, 'height' => 1],
['age' => 85, 'height' => 6],
['age' => 98, 'height' => 2],
['age' => 86, 'height' => 6],
['age' => 67, 'height' => 7]
];
第一時間想到array_multisort， 但是很遺憾的時預設情況下都是升序排列。
$datas = [
['age' => 67, 'height' => 2],
['age' => 86, 'height' => 7],
['age' => 85, 'height' => 6],
['age' => 98, 'height' => 2],
['age' => 86, 'height' => 6],
['age' => 67, 'height' => 7]
];
array_multisort($datas);
echo "
"; print_r($datas);
exit;
得到的結果是：
Array
(
[0] => Array
(
[age] => 67
[height] => 2
)
[1] => Array
(
[age] => 67
[height] => 7
)
[2] => Array
(
[age] => 85
[height] => 6
)
[3] => Array
(
[age] => 86
[height] => 6
)
[4] => Array
(
[age] => 86
[height] => 7
)
[5] => Array
(
[age] => 98
[height] => 2
)
)
2. 如何解決這個問題呢？
function array_multisort_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);
}
$datas = [
['age' => 67, 'height' => 2],
['age' => 86, 'height' => 7],
['age' => 85, 'height' => 6],
['age' => 98, 'height' => 2],
['age' => 86, 'height' => 6],
['age' => 67, 'height' => 7]
];
$sorted = array_multisort_orderby($datas, 'age',SORT_ASC , 'height', SORT_DESC);
echo "
"; var_dump($sorted);
本文由源碼時代PHP教育訓練學科講師原創出品