When dealing with variable data structures in PHP, what are some strategies for maintaining consistency and avoiding shifting elements?

When dealing with variable data structures in PHP, one strategy to maintain consistency and avoid shifting elements is to use associative arrays instead of numerical arrays. By using keys to access elements instead of relying on their position, you can ensure that the structure remains consistent even if elements are added or removed.

// Using associative arrays to maintain consistency and avoid shifting elements
$data = [
    'key1' => 'value1',
    'key2' => 'value2',
    'key3' => 'value3'
];

// Adding a new element without affecting the structure
$data['key4'] = 'value4';

// Removing an element without shifting other elements
unset($data['key2']);