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 ApcAdapter 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 | $value = apc_fetch($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 | $values = [];  | 
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| 42 | |||
| 43 |         foreach ($keys as $key) { | 
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| 44 | $value = apc_fetch($this->addNamespaceToKey($key), $success);  | 
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| 45 |             if ($success) { | 
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| 46 | $values[$key] = $value;  | 
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| 47 | }  | 
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| 48 | }  | 
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| 49 | |||
| 50 | return $values;  | 
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| 51 | }  | 
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| 52 | |||
| 53 | /**  | 
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| 54 | * @param mixed $value  | 
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| 55 | */  | 
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| 56 | public function set(string $key, $value): bool  | 
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| 57 |     { | 
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| 58 | return apc_store($this->addNamespaceToKey($key), $value, $this->ttl);  | 
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| 59 | }  | 
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| 60 | |||
| 61 | public function setMulti(array $data): bool  | 
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| 62 |     { | 
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| 63 | $namespacedData = $this->addNamespaceToKeys($data, true);  | 
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| 64 | $errors = apc_store($namespacedData, $this->ttl);  | 
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| 65 | |||
| 66 | return empty($errors);  | 
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| 67 | }  | 
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| 68 | |||
| 69 | public function contains(string $key): bool  | 
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| 70 |     { | 
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| 71 | return apc_exists($this->addNamespaceToKey($key));  | 
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| 72 | }  | 
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| 73 | |||
| 74 | public function delete(string $key): bool  | 
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| 75 |     { | 
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| 76 | apc_delete($this->addNamespaceToKey($key));  | 
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| 77 | |||
| 78 | return true;  | 
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| 79 | }  | 
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| 80 | |||
| 81 | public function deleteMulti(array $keys): bool  | 
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| 82 |     { | 
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| 83 |         foreach ($keys as $key) { | 
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| 84 | apc_delete($this->addNamespaceToKey($key));  | 
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| 85 | }  | 
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| 86 | |||
| 87 | return true;  | 
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| 88 | }  | 
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| 89 | |||
| 90 | public function flush(): bool  | 
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| 91 |     { | 
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| 92 |         return apc_clear_cache('user'); | 
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| 93 | }  | 
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| 94 | }  | 
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| 95 |