PHP: How to push to an array an other array, but without it creating a new value to the array -

i have 2 numeric arrays. 1 starts 0 , ends 24 - , other starts 25 , ends 50.

i want merge/push 1 starts 25 continue first one. have new array starts 0 , ends 50.

i using array_push isn't serving intentions, this:

how push array:

                  0 => string 'us' (length=2)                   1 => string 'au' (length=2)                   2 => string 'ca' (length=2)                   3 => string 'cn' (length=2)                   4 => string 'fr' (length=2)                   5 => string 'de' (length=2)                   6 => string 'gb' (length=2)                   7 => string 'it' (length=2)                   8 => string 'jp' (length=2)                   9 => string 'kr' (length=2)                   10 => string 'ru' (length=2)                   11 => string 'dz' (length=2)                   12 => string 'ao' (length=2)                   13 => string 'ar' (length=2)                   14 => string 'at' (length=2)                   15 => string 'az' (length=2)                   16 => string 'bb' (length=2)                   17 => string 'by' (length=2)                   18 => string 'be' (length=2)                   19 => string 'bm' (length=2)                   20 => string 'br' (length=2)                   21 => string 'bg' (length=2)                   22 => string 'cl' (length=2)                   23 => string 'co' (length=2)                   24 => string 'cr' (length=2)                   25 => array                        25 => string 'zz'                        26 => string 'xx'                        27 => string 'ww'  

ect'.

this want like:

                  0 => string 'us' (length=2)                   1 => string 'au' (length=2)                   2 => string 'ca' (length=2)                   3 => string 'cn' (length=2)                   4 => string 'fr' (length=2)                   5 => string 'de' (length=2)                   6 => string 'gb' (length=2)                   7 => string 'it' (length=2)                   8 => string 'jp' (length=2)                   9 => string 'kr' (length=2)                   10 => string 'ru' (length=2)                   11 => string 'dz' (length=2)                   12 => string 'ao' (length=2)                   13 => string 'ar' (length=2)                   14 => string 'at' (length=2)                   15 => string 'az' (length=2)                   16 => string 'bb' (length=2)                   17 => string 'by' (length=2)                   18 => string 'be' (length=2)                   19 => string 'bm' (length=2)                   20 => string 'br' (length=2)                   21 => string 'bg' (length=2)                   22 => string 'cl' (length=2)                   23 => string 'co' (length=2)                   24 => string 'cr' (length=2)                   25 => string 'zz' (length=2)                   26 => string 'xx' (length=2)                   27 => string 'ww' (length=2) ... ect'.  

simply use:

$array = $arr1 + $arr2 

or

array_merge($arr1, $arr2);