Are there built-in PHP array functions like next(), current(), and prev() that can be used to access neighboring elements without changing the data structure?

Yes, there are built-in PHP array functions that can be used to access neighboring elements without changing the data structure. The functions `current()`, `next()`, and `prev()` can be used to retrieve the current element, move the internal pointer to the next element, and move the internal pointer to the previous element, respectively. These functions are useful when iterating over an array without needing to modify the array itself.

$myArray = [1, 2, 3, 4, 5];

// Get the current element
echo current($myArray); // Output: 1

// Move the internal pointer to the next element
next($myArray);
echo current($myArray); // Output: 2

// Move the internal pointer to the previous element
prev($myArray);
echo current($myArray); // Output: 1