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<?php abstract class Mother { /** @var array */ private static $inMemoryCache = array(); public function testMethod($param) { $cacheKey = '_'.$param; if (!isset(self::$inMemoryCache[$cacheKey])) { echo PHP_EOL, 'compute result', PHP_EOL; self::$inMemoryCache[$cacheKey] = $param * 2; } return self::$inMemoryCache[$cacheKey]; } } final class Daughter extends Mother { } final class Son extends Mother { } $d = new Daughter(); $s = new Son(); $d->testMethod(1); $d->testMethod(1); $s->testMethod(1); $s->testMethod(1);
Output for git.master_jit, git.master, rfc.property-hooks
compute result

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