[英]Sort multidimensional array recursive by specific key
我試圖按其標簽遞歸排序此數組:
Array
(
[0] => Array
(
[id] => 6
[label] => Bontakt
[children] => Array
(
)
)
[1] => Array
(
[id] => 7
[label] => Ampressum
[children] => Array
(
[0] => Array
(
[id] => 5
[children] => Array
(
)
[label] => Bome
)
[1] => Array
(
[id] => 8
[children] => Array
(
)
[label] => Aome
)
[2] => Array
(
[id] => 10
[children] => Array
(
)
[label] => Come
)
)
)
[2] => Array
(
[id] => 9
[label] => Contakt
[children] => Array
(
)
)
[3] => Array
(
[id] => 11
[label] => Dead
[children] => Array
(
)
)
)
我讀過幾個問題,感覺還很接近,但是我無法弄清楚什么是行不通的:
function sortByAlpha($a, $b)
{
return strcmp(strtolower($a['label']), strtolower($b['label'])) > 0;
}
function alphaSort(&$a)
{
foreach ($a as $oneJsonSite)
{
if (count($oneJsonSite["children"]) > 0) alphaSort($oneJsonSite["children"]);
}
usort($a, 'sortByAlpha');
}
alphaSort($jsonSites);
當前輸出是這樣的:
Ampressum
Bome
Aome
Come
Bontakt
Contakt
Dead
子元素未排序...
看一下這個:
為了能夠直接在循環內修改數組元素,在$ value之前加&。 在這種情況下,該值將通過引用分配。 (從此處選擇: http : //php.net/manual/en/control-structures.foreach.php )
您應該嘗試以下一種方法:
function alphaSort(&$a)
{
foreach ($a as &$oneJsonSite)
{
if (count($oneJsonSite["children"]) > 0) alphaSort($oneJsonSite["children"]);
}
usort($a, 'sortByAlpha');
}
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