What best practices should PHP developers follow when working with arrays in PHP, especially when dealing with complex data structures?

When working with arrays in PHP, especially when dealing with complex data structures, it is important for PHP developers to follow best practices to ensure efficient and error-free code. One key practice is to properly initialize arrays before use to avoid unexpected behavior. Additionally, using built-in array functions like array_push, array_pop, array_shift, and array_unshift can help manipulate arrays effectively. Lastly, documenting the data structure and key-value pairs within the array can aid in understanding and maintaining the code in the future.

// Initializing an array
$data = [];

// Adding elements to the array
array_push($data, "element1");
array_push($data, "element2");

// Removing elements from the array
array_pop($data);

// Accessing elements in the array
echo $data[0];