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<?php interface Equalable { function equal(User $otherUser): bool; } class Transaction { function __construct( public int $amount, public string $type, ) {} } class User implements Equalable { private array $transactions = []; function __construct(public string $name) {} // Assume this is operator ==(...) function equal(User $otherUser): bool { // Junior developer only has use-case where he needs to the username. return $otherUser->name === $this->name; } function mergeTransactions(User $user) { $this->transactions = array_merge($this->transactions, $user->transactions); } function addTransaction(Transaction $transaction) { $this->transactions[] = $transaction; } function getTransactions(): array { return $this->transactions; } } function mergeUsers() { $users = []; foreach( ObjectCache::getCache() as $user) { if (!array_key_exists($user->name, $users)) { $users[$user->name] = $user; } if ($users[$user->name] !== $user) { $users[$user->name]->mergeTransactions($user); } } ObjectCache::set($users); } class ObjectCache { private static string $method; private static array $objects; static function getCache(): array { return self::$objects; } static function add(Equalable $eq): void { if (count(self::$objects) === 0) { self::$objects[] = $eq; return; } foreach (self::$objects as $object) { switch (self::$method) { case 'built-in': if ($eq != $object) { self::$objects[] = $eq; break; } break; case 'op-overload': // Assume this is $eq != $object if (!$eq->equal($object)) { self::$objects[] = $object; break; } break; } } } static function set(array $objects): void { self::$objects = $objects; } static function init(string $method): void { self::$method = $method; self::$objects = []; } static function search(string $prop, mixed $value): ?object { $values = array_column(self::$objects,$prop); $index = array_search($value,$values); return $index !== false ? self::$objects[$index] : null; } } function loadFromDB() { $u = new User( "John" ); $u->addTransaction(new Transaction(100,'credit')); $u->addTransaction(new Transaction(500,'credit')); $u->addTransaction(new Transaction(250,'credit')); return $u; } foreach( ['built-in','op-overload'] as $method) { ObjectCache::init($method); echo "Method: {$method}\n"; $john = new User( "John" ); ObjectCache::add( $john ); ObjectCache::add( loadFromDB()); mergeUsers(); print_r(ObjectCache::getCache()); }

Version	System time (s)	User time (s)	Memory (MiB)
8.4.14	0.012	0.010	17.59
8.4.13	0.011	0.009	18.45
8.4.12	0.009	0.009	24.14
8.4.11	0.012	0.008	18.94
8.4.10	0.010	0.010	18.76
8.4.9	0.010	0.007	20.80
8.4.8	0.011	0.010	18.88
8.4.7	0.002	0.007	18.02
8.4.6	0.009	0.009	18.40
8.4.5	0.013	0.009	19.50
8.4.4	0.010	0.010	17.59
8.4.3	0.011	0.008	23.98
8.4.2	0.012	0.006	19.41
8.4.1	0.009	0.000	19.61
8.3.26	0.013	0.006	16.63
8.3.25	0.009	0.010	17.18
8.3.24	0.012	0.007	17.38
8.3.23	0.013	0.007	16.42
8.3.22	0.007	0.007	18.91
8.3.21	0.012	0.007	16.64
8.3.20	0.005	0.004	16.51
8.3.19	0.005	0.004	18.98
8.3.18	0.010	0.008	18.36
8.3.17	0.011	0.007	17.00
8.3.16	0.011	0.007	20.60
8.3.15	0.003	0.016	17.48
8.3.14	0.006	0.003	17.23
8.3.13	0.008	0.000	18.59
8.3.12	0.004	0.015	19.32
8.3.11	0.015	0.010	17.41
8.3.10	0.013	0.003	18.43
8.3.5	0.015	0.000	18.38
8.2.29	0.006	0.002	22.14
8.2.28	0.010	0.010	18.45
8.2.27	0.004	0.016	16.86
8.2.26	0.004	0.004	17.21
8.2.25	0.004	0.004	17.22
8.2.24	0.007	0.014	18.22
8.2.23	0.012	0.003	18.22
8.2.22	0.006	0.012	18.24
8.1.33	0.014	0.006	22.07
8.1.32	0.012	0.009	16.03
8.1.31	0.006	0.003	16.72
8.1.30	0.010	0.000	18.10