Warning: array_push() expects parameter 1 to be array

Question

This is my code, and when I run this function I get this :Warning: array_push() expects parameter 1 to be array However I define $printed as an array

Answer 1

You need validate whit is_array:

Example

if (is_array($arNumbers)) {
    $cellid =  array_push($arNumbers, 0);
}