How to delete an array of array [closed] - php

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I have an array like this :
[[a,b],[c,d]]
How can I delete the outer array so it becomes:
[a,b],[c,d]
I tried using unset but cannot find a solution.
i got this answer by asign arrays in loops to another variable.. so how can i access the loops outside the loop it self?
foreach($arr3 as $key => $value)
{
$newArr[$key] = $value;
echo json_encode($value); // this will answer my question
}
echo json_encode($value); // when i echo outside loop it will not display as inside loop

Answer 1

Simple way to do this is as below.
foreach($array as $key => $value)
{
$newArr[$key] = $value;
}
$newArr contains new array which you are asking.
Comment Response
You can also con cat it.
$concat = "";
foreach($arr3 as $key => $value)
{
$newArr[$key] = $value;
$concat .= json_encode($value).',';
}
echo rtrim($concat,',');

Answer 2

You should not delete the outer array. You can simply access the index of the array and cast it to another array.
As an example;
$arr = array(array('x','y'),array('z'));
You can access this with;
$arr[0];

Answer 3

$array2=$array[0];
$array3=$array[1];
unset($array);