What are the potential pitfalls of using fixed array definitions in PHP when trying to reassemble arrays?

When using fixed array definitions in PHP, one potential pitfall is that it limits the flexibility to dynamically reassemble arrays with varying lengths. To solve this issue, you can use PHP's array functions like `array_merge` or `array_push` to combine arrays together without needing to predefine their size.

// Example of dynamically reassembling arrays using array_merge
$array1 = [1, 2, 3];
$array2 = [4, 5, 6];
$result = array_merge($array1, $array2);
print_r($result);