如何解决按子数组值分组数组
$arr = array();
foreach ($old_arr as $key => $item) {
$arr[$item['id']][$key] = $item;
}
ksort($arr, SORT_NUMERIC);
解决方法
我有以下格式的子数组数组:
array
(
a => array ( id = 20,name = chimpanzee )
b => array ( id = 40,name = meeting )
c => array ( id = 20,name = dynasty )
d => array ( id = 50,name = chocolate )
e => array ( id = 10,name = bananas )
f => array ( id = 50,name = fantasy )
g => array ( id = 50,name = football )
)
我想根据每个子数组中的id字段将其分组为一个新数组。
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 )
)
)
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