shift all array elements up one level in a multidimensional array

Question

I have an array that may look like

$arr = array(
    array(
        'test1' => 'testing1'
    ),
    array(
        'test2' => array(
         1 =>'testing2
    )
);

and I want to turn it into

$newArr = array(
    'test1' => 'testing1',
    'test2' => array(
         1 => 'testing2'
     )
);

so i have been trying to shift all array elements up one level.

eidt:

this is my method that combines 2 array together:

public function arrayMerge($arr1, $arr2)
            {
                foreach($arr2 as $key => $value) {

                    $condition = (array_key_exists($key, $arr1) && is_array($value));
                    $arr1[$key] = ($condition ? $this->arrayMerge($arr1[$key], $arr2[$key]) : $value);
                }

                return $arr1;
            }

Answer 1

It's somewhat trivial, many ways are possible.

For example using the array union operator (+)^­Docs creating the union of all arrays inside the array:

$newArr = array();
foreach ($arr as $subarray)
    $newArr += $subarray;

Or by using array_merge^­Docs with all subarrays at once via call_user_func_array^­Docs:

$newArray = call_user_func_array('array_merge', $arr);

Answer 2

Try

$arr = array(
        array('test1' => 'testing1' ), 
        array('test2' => array(1 =>'testing2')) 
);

$new = array();
foreach($arr as $value) {
    $new += $value;
}
var_dump($new);

Output

array
  'test1' => string 'testing1' (length=8)
  'test2' => 
    array
      1 => string 'testing2' (length=8)