我有如下所示的数组
Array
(
[0] => Array
(
[catid] => 3
[parent_id] => 1
[catname] => Uncategorized
[catdesc] =>
[nleft] => 20
[nright] => 21
[nlevel] => 1
)
[1] => Array
(
[catid] => 5
[parent_id] => 2
[catname] => Category 2
[catdesc] =>
[nleft] => 7
[nright] => 8
[nlevel] => 2
)
[2] => Array
(
[catid] => 3
[parent_id] => 1
[catname] => Uncategorized
[catdesc] =>
[nleft] => 20
[nright] => 21
[nlevel] => 1
)
[3] => Array
(
[catid] => 3
[parent_id] => 1
[catname] => Uncategorized
[catdesc] =>
[nleft] => 20
[nright] => 21
[nlevel] => 1
)
[4] => Array
(
[catid] => 7
[parent_id] => 2
[catname] => Flower
[catdesc] =>
[nleft] => 11
[nright] => 18
[nlevel] => 2
)
[5] => Array
(
[catid] => 8
[parent_id] => 7
[catname] => Lillies
[catdesc] =>
[nleft] => 12
[nright] => 13
[nlevel] => 3
)
[6] => Array
(
[catid] => 10
[parent_id] => 7
[catname] => Jasmine
[catdesc] =>
[nleft] => 16
[nright] => 17
[nlevel] => 3
)
[7] => Array
(
[catid] => 7
[parent_id] => 2
[catname] => Flower
[catdesc] =>
[nleft] => 11
[nright] => 18
[nlevel] => 2
)
[8] => Array
(
[catid] => 8
[parent_id] => 7
[catname] => Lillies
[catdesc] =>
[nleft] => 12
[nright] => 13
[nlevel] => 3
)
[9] => Array
(
[catid] => 10
[parent_id] => 7
[catname] => Jasmine
[catdesc] =>
[nleft] => 16
[nright] => 17
[nlevel] => 3
)
[10] => Array
(
[catid] => 3
[parent_id] => 1
[catname] => Uncategorized
[catdesc] =>
[nleft] => 20
[nright] => 21
[nlevel] => 1
)
[11] => Array
(
[catid] => 3
[parent_id] => 1
[catname] => Uncategorized
[catdesc] =>
[nleft] => 20
[nright] => 21
[nlevel] => 1
)
[12] => Array
(
[catid] => 10
[parent_id] => 7
[catname] => Jasmine
[catdesc] =>
[nleft] => 16
[nright] => 17
[nlevel] => 3
)
[13] => Array
(
[catid] => 3
[parent_id] => 1
[catname] => Uncategorized
[catdesc] =>
[nleft] => 20
[nright] => 21
[nlevel] => 1
)
[14] => Array
(
[catid] => 8
[parent_id] => 7
[catname] => Lillies
[catdesc] =>
[nleft] => 12
[nright] => 13
[nlevel] => 3
)
)
从这个数组中，我想得到唯一 Arrays.ie。如果 catId 相同，则需要从列表中删除。我该怎么做？
如果您使用的是旧版本：
$out = array();
foreach ($arr as $row) {
$out[$row['catid']] = $row;
}
$array = array_values($out); // only required if you mind the new array being assoc
假设你使用的是PHP>5.3，你可以使用array_filter：
$catIds = array();
$myarray = array_filter($myarray, function($el) use (&$catIds) {
if (in_array($el['catid'], $catIds)) { // if the id has already been seen
return false; // remove it
} else {
$catIds[] = $el['catid']; // the id has now been seen
return true; // but keep the first occurrence of it
}
});
你从哪里得到那个数组（假设它没有神奇地出现）？如果您从数据库中获取这些结果，那么将它们限制在那里不是更容易吗？例如
SELECT DISTINCT cat_id, parent_id, catname FROM yourtable;
您可以使用它来将多维数组转换为单个数组。
$out = array();
for($i=0;$i<count($rows);$i++) {
$out = $rows[$i];
}
你可以通过以下方式检查这一点
print_r($out);