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README.md
# Cache that expires in the blink of an eye [](https://packagist.org/packages/spatie/blink) [](https://github.com/spatie/blink/actions/workflows/run-tests.yml) [](https://packagist.org/packages/spatie/blink) This package contains a class called `Blink` that can cache values. The cache only spans the length of a single request. It can be used like this: ```php $blink = new Blink(); $blink->put('key', 'value'); $blink->get('key'); // Returns 'value' $blink->get('prefix*'); // Returns an array of values whose keys start with 'prefix' // once will only execute the given callable if the given key didn't exist yet $expensiveFunction = function() { return rand(); }); $blink->once('random', $expensiveFunction); // returns random number $blink->once('random', $expensiveFunction); // returns the same number $blink->has('key'); // Returns true $blink->has('prefix*'); // Returns true if the blink contains a key that starts with 'prefix' // Specify a default value for when the specified key does not exist $blink->get('non existing key', 'default') // Returns 'default' $blink->put('anotherKey', 'anotherValue'); // Put multiple items in one go $blink->put(['ringo' => 'drums', 'paul' => 'bass']); $blink->all(); // Returns an array with all items $blink->forget('key'); // Removes the item $blink->forget('prefix*'); // Forget all items of which the key starts with 'prefix' $blink->flush(); // Empty the entire blink $blink->flushStartingWith('somekey'); // Remove all items whose keys start with "somekey" $blink->increment('number'); // $blink->get('number') will return 1 $blink->increment('number'); // $blink->get('number') will return 2 $blink->increment('number', 3); // $blink->get('number') will return 5 // Blink implements ArrayAccess $blink['key'] = 'value'; $blink['key']; // Returns 'value' isset($blink['key']); // Returns true unset($blink['key']); // Equivalent to removing the value // Blink implements Countable count($blink); // Returns 0 $blink->put('key', 'value'); count($blink); // Returns 1 ``` If you want to use the same instance within the current request, you can use the static method `global`. ```php Blink::global()->put('key', 'value'); Blink::global()->get('key') // Returns 'value' ``` Read the [usage](#usage) section of this readme to learn the other methods. ## Support us [<img src="https://github-ads.s3.eu-central-1.amazonaws.com/blink.jpg?t=1" width="419px" />](https://spatie.be/github-ad-click/blink) We invest a lot of resources into creating [best in class open source packages](https://spatie.be/open-source). You can support us by [buying one of our paid products](https://spatie.be/open-source/support-us). We highly appreciate you sending us a postcard from your hometown, mentioning which of our package(s) you are using. You'll find our address on [our contact page](https://spatie.be/about-us). We publish all received postcards on [our virtual postcard wall](https://spatie.be/open-source/postcards). ## Installation You can install the package via composer: ``` bash composer require spatie/blink ``` ## Usage A `Blink` instance can just be newed up. ```php $blink = new \Spatie\Blink\Blink() ``` You can call the following methods on it: ### put ```php /** * Put a value in the blink cache. * * @param string|array $name * @param string|int|null $value * * @return $this */ public function put($name, $value = null) ``` ### get ```php /** * Get a value from the blink cache. * * This function has support for the '*' wildcard. * * @param string $name * * @return null|string */ public function get(string $name) ``` ### has ```php /* * Determine if the blink cache has a value for the given name. * * This function has support for the '*' wildcard. */ public function has(string $name) : bool ``` ### once ```php /** * Only if the given key is not present in the blink cache the callable will be executed. * * The result of the callable will be stored in the given key and returned. * * @param $key * @param callable $callable * * @return mixed */ public function once($key, callable $callable) ``` ### onceIf ```php /** * Use the "once" method only if the given condition is true. * * Otherwise, the callable will be executed. * * @param bool $shouldBlink * @param $key * @param callable * * @return mixed */ public function onceIf($shouldBlink, $key, callable $callable) ``` ### all ```php /* * Get all values in the blink cache. */ public function all() : array ``` ### allStartingWith ```php /** * Get all values from the blink cache which keys start with the given string. * * @param string $startingWith * * @return array */ public function allStartingWith(string $startingWith = '') : array ``` ### forget ```php /** * Forget a value from the blink cache. * * This function has support for the '*' wildcard. * * @param string $key * * @return $this */ public function forget(string $key) ``` ### flush ```php /** * Flush all values from the blink cache. * * @return $this */ public function flush() ``` ### flushStartingWith ```php /** * Flush all values from the blink cache which keys start with the specified value. * * @param string $startingWith * * @return $this */ public function flushStartingWith(string $startingWith) ``` ### pull ```php /** * Get and forget a value from the blink cache. * * This function has support for the '*' wildcard. * * @param string $name * * @return null|string */ public function pull(string $name) ``` ### increment ```php /** * Increment a value from the blink cache. * * @param string $name * @param int $by * * @return int|null|string */ public function increment(string $name, int $by = 1) ``` ### decrement ```php /** * Decrement a value from the blink cache. * * @param string $name * @param int $by * * @return int|null|string */ public function decrement(string $name, int $by = 1) ``` ## Changelog Please see [CHANGELOG](CHANGELOG.md) for more information what has changed recently. ## Testing ``` bash $ composer test ``` ## Contributing Please see [CONTRIBUTING](https://github.com/spatie/.github/blob/main/CONTRIBUTING.md) for details. ## Security If you've found a bug regarding security please mail [security@spatie.be](mailto:security@spatie.be) instead of using the issue tracker. ## Credits - [Freek Van der Herten](https://github.com/freekmurze) - [All Contributors](../../contributors) We got the idea and the name for this package from [Statamic's Blink helper](https://docs.statamic.com/addons/helpers#blink-cache). We reached out to them and got permission for using the `blink` name. ## License The MIT License (MIT). Please see [License File](LICENSE.md) for more information.
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