Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
| 1 | <?php  | 
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| 9 | class ApcuAdapter extends AbstractAdapter implements AdapterInterface  | 
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| 10 | { | 
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| 11 | protected int $ttl = 0;  | 
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| 12 | |||
| 13 | public function __construct(array $config = [])  | 
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| 14 |     { | 
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| 15 | // config  | 
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| 16 |         if (isset($config['ttl'])) { | 
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| 17 | $this->ttl = (int) $config['ttl'];  | 
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| 18 | }  | 
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| 19 | |||
| 20 |         if (isset($config['cache_not_found_keys'])) { | 
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| 21 | $this->cacheNotFoundKeys = (bool) $config['cache_not_found_keys'];  | 
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| 22 | }  | 
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| 23 | }  | 
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| 24 | |||
| 25 | /**  | 
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| 26 | * @return mixed  | 
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| 27 | */  | 
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| 28 | public function get(string $key)  | 
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| 29 |     { | 
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| 30 | $value = apcu_fetch($this->addNamespaceToKey($key), $success);  | 
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| 31 | |||
| 32 |         if (!$success) { | 
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| 33 | throw new KeyNotFoundException();  | 
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| 34 | }  | 
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| 35 | |||
| 36 | return $value;  | 
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| 37 | }  | 
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| 38 | |||
| 39 | public function getMulti(array $keys): array  | 
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| 40 |     { | 
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| 41 | $namespacedKeys = apcu_fetch($this->addNamespaceToKeys($keys));  | 
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| 42 | |||
| 43 | return $this->removeNamespaceFromKeys($namespacedKeys);  | 
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| 44 | }  | 
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| 45 | |||
| 46 | /**  | 
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| 47 | * @param mixed $value  | 
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| 48 | */  | 
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| 49 | public function set(string $key, $value): bool  | 
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| 50 |     { | 
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| 51 | return apcu_store($this->addNamespaceToKey($key), $value, $this->ttl);  | 
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| 52 | }  | 
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| 53 | |||
| 54 | public function setMulti(array $data): bool  | 
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| 55 |     { | 
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| 56 | $namespacedData = $this->addNamespaceToKeys($data, true);  | 
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| 57 | $errors = apcu_store($namespacedData, $this->ttl);  | 
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| 58 | |||
| 59 | return empty($errors);  | 
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| 60 | }  | 
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| 61 | |||
| 62 | public function contains(string $key): bool  | 
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| 63 |     { | 
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| 64 | return apcu_exists($this->addNamespaceToKey($key));  | 
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| 65 | }  | 
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| 66 | |||
| 67 | public function delete(string $key): bool  | 
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| 68 |     { | 
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| 69 | apcu_delete($this->addNamespaceToKey($key));  | 
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| 70 | |||
| 71 | return true;  | 
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| 72 | }  | 
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| 73 | |||
| 74 | public function deleteMulti(array $keys): bool  | 
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| 75 |     { | 
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| 76 |         foreach ($keys as $key) { | 
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| 77 | apcu_delete($this->addNamespaceToKey($key));  | 
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| 78 | }  | 
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| 79 | |||
| 80 | return true;  | 
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| 81 | }  | 
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| 82 | |||
| 83 | public function flush(): bool  | 
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| 84 |     { | 
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| 85 | return apcu_clear_cache();  | 
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| 86 | }  | 
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| 87 | }  | 
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| 88 |