What is the significance of using the -1 index adjustment in PHP array manipulation?

When manipulating arrays in PHP, it's important to remember that array indexes start at 0. This means that the last element in an array has an index of count($array) - 1, not count($array). When accessing or manipulating the last element of an array, it's necessary to use the -1 index adjustment to correctly target the last element.

// Example of using the -1 index adjustment to access the last element of an array
$array = [1, 2, 3, 4, 5];
$lastElement = $array[count($array) - 1];

echo $lastElement; // Outputs: 5