thunderer / Once

once() function experiment

Once

This is a small experiment about making a function once() that makes sure that given callable is called only once.

Remember, DO NOT USE THIS IN ANY PROJECT.

Inspiration:

• https://murze.be/2016/11/magic-memoization-function
• https://github.com/spatie/once

Usage

Closure

$closure = function() {
    $range = range('A', 'Z');

    return $range[array_rand($range)];
}

assert(once($closure) === once($closure));

Class

$class = new class($range) {
    public function foo() {
        $range = range('A', 'Z');

        return $range[array_rand($range)];
    }
};

assert(once([$class, 'foo']) === once([$class, 'foo']));

License

MIT, of course.