how we remove index in the array and merge - php

Question

Bellow is my Array in this array
****i want to remove second level index 1 and 2 and merge two arrays in one array****
$array1 = Array
(
[1] => Array
(
[1] => Array
(
[2] => 4
[3] => 2
[4] => 3
[5] =>
)
[2] => Array
(
[9] => 4
[10] =>
[11] => 4
[12] => 4
)
)
[2] => Array
(
[1] => Array
(
[2] => 3
[3] =>
[4] => 4.1428571428571
[5] => 5
)
[2] => Array
(
[9] => 3
[10] => 5
[11] => 5
[12] => 3
)
)
[3] => Array
(
[1] => Array
(
[2] => 5
[3] => 5
[4] =>
[5] => 4.1428571428571
)
[2] => Array
(
[9] => 3
[10] => 4.4285714285714
[11] => 4.4285714285714
[12] => 5
)
)
my aspected output is bellow where second level index is removed and arrays are merged
$array1= Array
(
[1] => Array
(
[2] => 4
[3] => 2
[4] => 3
[5] =>
[9] => 4
[10] =>
[11] => 4
[12] => 4
)
[2] => Array
(
[2] => 3
[3] =>
[4] => 4.1428571428571
[5] => 5
[9] => 3
[10] => 5
[11] => 5
[12] => 3
)
)
[3] => Array
(
[2] => 5
[3] => 5
[4] =>
[5] => 4.1428571428571
[9] => 3
[10] => 4.4285714285714
[11] => 4.4285714285714
[12] => 5
)
And i tried :
foreach($array1 as $arrkey => $arrvalue)
{
foreach($arrvalue as $innerkey => $innervalue){
//unset($cutvalu[$cutck]);
foreach($innervalue as $subkey => $subvalue){
#$array1[$arrkey][$subkey];
}
}
}
echo "<pre>"; print_r($array1);echo "<pre>";

Answer 1

Try this:
foreach($array1 as $arrkey => $arrvalue)
{
foreach($arrvalue as $innerkey => $innervalue){
foreach($innervalue as $subkey => $subvalue){
$new_array[$arrkey][$subkey] = $subvalue; // Change this line
}
}
}
echo "<pre>"; print_r($new_array);echo "<pre>";
This will give you what you're looking for.