How to connect arrays?

Question

PHP

Array ( [0] => 10 [1] => 11 [2] => 12 ) Array ( [0] => 9 )

It is derived from this

$st = $rfx['nomer'];  $vc = explode( ', ', $st);    print_r($vc);

$st - all arrays are stored there. $vc arranges the elements of them one by one simply.

Answer 1

$res=array_merge(array(),array());
________
well, if you have several arrays in one array that need to be combined into one, then probably like this:

$arr=[
     [1,2,3,4,5,6,7,8,9,0],
     [11,22,33,44,55,66,77]
];
$res=array_merge($arr[0],$arr[0]);

Answer 2

What does "$st - all arrays are stored there. $vc arranges their elements one by one simply. "?
Please provide a code example if array_merge() does not work for you.