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<?php |
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namespace Spatie\Once; |
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class Cache |
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{ |
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/** @var array */ |
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public static $values = []; |
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/** |
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* Determine if a value exists for a given object / hash. |
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* |
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* @param mixed $object |
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* @param string $backtraceHash |
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* |
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* @return bool |
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*/ |
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public static function has($object, string $backtraceHash): bool |
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{ |
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$objectHash = spl_object_hash($object); |
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if (! isset(static::$values[$objectHash])) { |
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return false; |
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} |
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return array_key_exists($backtraceHash, static::$values[$objectHash]); |
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} |
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/** |
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* Retrieve a value for an object / hash. |
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* |
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* @param mixed $object |
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* @param string $backtraceHash |
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* |
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* @return mixed |
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*/ |
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public static function get($object, string $backtraceHash) |
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{ |
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return static::$values[spl_object_hash($object)][$backtraceHash]; |
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} |
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/** |
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* Set a cached value for an object / hash. |
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* |
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* @param mixed $object |
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* @param string $backtraceHash |
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* @param mixed $value |
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*/ |
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public static function set($object, string $backtraceHash, $value) |
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{ |
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static::addDestroyListener($object); |
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static::$values[spl_object_hash($object)][$backtraceHash] = $value; |
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} |
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/** |
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* Forget the stored items for the given objectHash. |
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* |
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* @param string $objectHash |
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*/ |
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public static function forget(string $objectHash) |
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{ |
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unset(static::$values[$objectHash]); |
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} |
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protected static function addDestroyListener($object) |
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{ |
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$randomPropertyName = '___once_destroy_listener'; |
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if (isset($object->$randomPropertyName)) { |
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return; |
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} |
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$object->$randomPropertyName = new class($object) { |
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public function __construct($object) |
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{ |
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$this->objectHash = spl_object_hash($object); |
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} |
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public function __destruct() |
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{ |
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Cache::forget($this->objectHash); |
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} |
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}; |
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} |
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} |
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spatie /
once
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: