Act as a Principal Software Architect and Performance Engineer.
Your task is to perform a comprehensive performance audit and refactor of this entire codebase.
Before making any changes:
Thoroughly analyze the architecture, code structure, dependencies, database access patterns, caching strategy, queues, API endpoints, background jobs, asset loading, and deployment configuration.
Identify all performance bottlenecks, including but not limited to:
| <?php | |
| /** | |
| * Compare two arrays and return a list of items only in array1 (deletions) and only in array2 (insertions) | |
| * | |
| * @param array $array1 The 'original' array, for comparison. Items that exist here only are considered to be deleted (deletions). | |
| * @param array $array2 The 'new' array. Items that exist here only are considered to be new items (insertions). | |
| * @param array $keysToCompare A list of array key names that should be used for comparison of arrays (ignore all other keys) | |
| * @return array[] array with keys 'insertions' and 'deletions' | |
| */ | |
| public static function arrayDifference(array $array1, array $array2, array $keysToCompare = null) { |