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<?php |
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declare(strict_types=1); |
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namespace Yiisoft\Cache; |
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use Psr\SimpleCache\CacheInterface; |
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/** |
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* PrefixedCache decorates any PSR-16 cache to add global prefix. It is added to every cache key so that it is unique |
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* globally in the whole cache storage. It is recommended that you set a unique cache key prefix for each application |
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* if the same cache storage is being used by different applications. |
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* |
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* ```php |
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* $cache = new PrefixedCache(new ArrayCache(), 'my_app_'); |
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* $cache->set('answer', 42); // Will set 42 to my_app_answer key. |
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* ``` |
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*/ |
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final class PrefixedCache implements CacheInterface |
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{ |
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private CacheInterface $cache; |
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private string $prefix; |
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/** |
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* @param CacheInterface $cache PSR-16 cache to add prefix to. |
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* @param string $prefix Prefix to use for all cache keys. |
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*/ |
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public function __construct(CacheInterface $cache, string $prefix) |
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{ |
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$this->cache = $cache; |
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$this->prefix = $prefix; |
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} |
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public function get($key, $default = null) |
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{ |
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return $this->cache->get($this->prefix . $key, $default); |
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} |
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public function set($key, $value, $ttl = null) |
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{ |
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return $this->cache->set($this->prefix . $key, $value, $ttl); |
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} |
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public function delete($key) |
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{ |
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return $this->cache->delete($this->prefix . $key); |
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} |
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public function clear() |
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{ |
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return $this->cache->clear(); |
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} |
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public function getMultiple($keys, $default = null) |
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{ |
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$prefixedKeys = []; |
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foreach ($keys as $key) { |
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$prefixedKeys[] = $this->prefix . $key; |
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} |
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return $this->cache->getMultiple($prefixedKeys, $default); |
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} |
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public function setMultiple($values, $ttl = null) |
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{ |
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$prefixedValues = []; |
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foreach ($values as $key => $value) { |
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$prefixedValues[$this->prefix . $key] = $value; |
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} |
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return $this->cache->setMultiple($prefixedValues, $ttl); |
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} |
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public function deleteMultiple($keys) |
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{ |
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$prefixedKeys = []; |
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foreach ($keys as $key) { |
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$prefixedKeys[] = $this->prefix . $key; |
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} |
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return $this->cache->deleteMultiple($prefixedKeys); |
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} |
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public function has($key) |
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{ |
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return $this->cache->has($this->prefix . $key); |
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} |
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} |
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yiisoft /
cache
Let?s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let?s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: