What are the advantages and disadvantages of using pre-written code solutions versus writing code from scratch when working with arrays in PHP, especially for beginners?

When working with arrays in PHP, beginners may struggle with writing efficient and error-free code from scratch. Using pre-written code solutions can save time and reduce the chances of making mistakes. However, relying too heavily on pre-written code can hinder understanding of fundamental programming concepts and limit the ability to customize solutions to specific needs.

// Example of using a pre-written code solution to merge two arrays in PHP
$array1 = [1, 2, 3];
$array2 = [4, 5, 6];
$mergedArray = array_merge($array1, $array2);
print_r($mergedArray);