How can I succeed to filter a multidimensional with a help of other array value as keys for the first array.
$multidimensional = [
['var1' => 'val1'],
['var2' => 'val2'],
['var3' => 'val3'],
['val4' => 'val4'],
];
$filter = [1, 3];
The final result should be:
$multidimensional = [
1 => ['var2' => 'val2'],
3 => ['val4' => 'val4']
];
It should be something similar to array_slice() or some other method. How can I easily perform such a task?
You can use the array_intersect_key function:
$result = array_intersect_key($multidimensional, array_flip($filter));
To expand upon my comment with a small example
<?php
$arrayOne = [
1 => ['foo' => 'bar'],
2 => ['foo' => 'bar'],
3 => ['foo' => 'bar'],
4 => ['foo' => 'bar'],
];
$arrayTwo = [1 => [], 3 => []];
print_r(array_intersect_key($arrayOne, $arrayTwo));
see array_intersect_key on php.net
Another variation using array_diff_key and array_flip functions:
$multidimensional = array_diff_key($multidimensional, array_diff_key($multidimensional, array_flip($filter)));
print_r($multidimensional);
The output:
Array
(
[1] => Array
(
[var2] => val2
)
[3] => Array
(
[val4] => val4
)
)
