删除“列"的最佳方法来自多维数组 [英] Best way to delete "column" from multidimensional array
问题描述
我有一个多维的 php 数组来表示这样的表
I have a multidimensional php array that represents a table like this
-------------
| A | 0 | A |
|---|---|---|
| 0 | 0 | 0 |
|---|---|---|
| A | 0 | A |
-------------
所以数组看起来像这样:
so the array looks like this:
array (size=3)
0 =>
array (size=3)
0 => string 'A' (length=1)
1 => string '0' (length=1)
2 => string 'A' (length=1)
1 =>
array (size=3)
0 => string '0' (length=1)
1 => string '0' (length=1)
2 => string '0' (length=1)
2 =>
array (size=3)
0 => string 'A' (length=1)
1 => string '0' (length=1)
2 => string 'A' (length=1)
现在我想删除第二行和第二列(顺便说一句,这只是一个简化的例子).
删除行很容易:
Now i want to delete the second row and the second column (this is just a simplified example btw).
Deleting the row is easy:
array_splice($array, 1, 1);
我发现了这种方法但是想知道是否有更简单的方法(类似于行)来删除列?也许先转置数组?
I found this approach but was wondering if there was a simpler way (similar to the row) of deleting the column as well? Maybe transposing the array first?
推荐答案
试试这个:
function delete_row(&$array, $offset) {
return array_splice($array, $offset, 1);
}
function delete_col(&$array, $offset) {
return array_walk($array, function (&$v) use ($offset) {
array_splice($v, $offset, 1);
});
}
在 Ideone 上测试:http://ideone.com/G5zRi0
Tested on Ideone: http://ideone.com/G5zRi0
编辑(Amade):
delete_col 函数也可以稍微修改以处理缺少列的数组:
delete_col function can also be slightly modified to work with arrays with missing columns:
function delete_col(&$array, $key) {
return array_walk($array, function (&$v) use ($key) {
unset($v[$key]);
});
}
这可以用于例如当您需要遍历数组并在每一步中删除一些列时.使用 array_splice 而不是 unset 的函数在这种情况下是不合适的(它基于偏移量而不是基于键).
This can be used e.g. when you need to iterate over an array and remove some columns in each step. A function using array_splice instead of unset would not be appropriate in such scenarios (it's offset-based and not key-based).
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