<?php declare(strict_types=1); namespace Doctrine\DBAL\Platforms\Keywords; use function array_flip; use function array_map; use function strtoupper; /** * Abstract interface for a SQL reserved keyword dictionary. */ abstract class KeywordList { /** @var string[]|null */ private ?array $keywords = null; /** * Checks if the given word is a keyword of this dialect/vendor platform. */ public function isKeyword(string $word): bool { if ($this->keywords === null) { $this->initializeKeywords(); } return isset($this->keywords[strtoupper($word)]); } protected function initializeKeywords(): void { $this->keywords = array_flip(array_map('strtoupper', $this->getKeywords())); } /** * Returns the list of keywords. * * @return string[] */ abstract protected function getKeywords(): array; }
cải xoăn