次の形式のサブ配列の配列があります。
[
'a' => ['id' => 20, 'name' => 'chimpanzee'],
'b' => ['id' => 40, 'name' => 'meeting'],
'c' => ['id' => 20, 'name' => 'dynasty'],
'd' => ['id' => 50, 'name' => 'chocolate'],
'e' => ['id' => 10, 'name' => 'bananas'],
'f' => ['id' => 50, 'name' => 'fantasy'],
'g' => ['id' => 50, 'name' => 'football']
]
そして、各サブ配列の id フィールドに基づいて、それを新しい配列にグループ化したいと思います。
array
(
10 => array
(
e => array ( id = 10, name = bananas )
)
20 => array
(
a => array ( id = 20, name = chimpanzee )
c => array ( id = 20, name = dynasty )
)
40 => array
(
b => array ( id = 40, name = meeting )
)
50 => array
(
d => array ( id = 50, name = chocolate )
f => array ( id = 50, name = fantasy )
g => array ( id = 50, name = football )
)
)
ベストアンサー1
$arr = array();
foreach ($old_arr as $key => $item) {
$arr[$item['id']][$key] = $item;
}
ksort($arr, SORT_NUMERIC);