PHP文件缓存与静态生成技术文件缓存是最简单直接的缓存方式。不需要安装Redis或Memcached直接用文件系统做缓存。今天说说文件缓存的实现和静态页面生成。文件缓存的核心逻辑是检查缓存文件是否存在且未过期如果有效则直接返回缓存内容否则重新生成并写入缓存。phpclass FileCache{private string $cacheDir;private int $defaultTtl;public function __construct(string $cacheDir /tmp/cache, int $defaultTtl 3600){$this-cacheDir rtrim($cacheDir, /);$this-defaultTtl $defaultTtl;if (!is_dir($this-cacheDir)) {mkdir($this-cacheDir, 0755, true);}}public function get(string $key, mixed $default null): mixed{$path $this-getPath($key);if (!file_exists($path)) return $default;$data file_get_contents($path);$entry unserialize($data);if ($entry false) return $default;if (time() $entry[expires]) {unlink($path);return $default;}return $entry[value];}public function set(string $key, mixed $value, ?int $ttl null): bool{$ttl $ttl ?? $this-defaultTtl;$entry [value $value, expires time() $ttl];return file_put_contents($this-getPath($key), serialize($entry), LOCK_EX) ! false;}public function delete(string $key): bool{$path $this-getPath($key);if (file_exists($path)) return unlink($path);return true;}public function has(string $key): bool{$path $this-getPath($key);if (!file_exists($path)) return false;$data file_get_contents($path);$entry unserialize($data);if ($entry false || time() $entry[expires]) {if (file_exists($path)) unlink($path);return false;}return true;}public function flush(): void{$files glob($this-cacheDir . /*.cache);foreach ($files as $file) {unlink($file);}}public function remember(string $key, callable $callback, ?int $ttl null): mixed{$value $this-get($key);if ($value ! null) return $value;$value $callback();$this-set($key, $value, $ttl);return $value;}private function getPath(string $key): string{return $this-cacheDir . / . md5($key) . .cache;}}$cache new FileCache(/tmp/cache, 300);$data $cache-remember(expensive_data, function () {sleep(2);return [result 这是缓存的数据, time microtime(true)];}, 60);print_r($data);?静态页面生成是PHP性能优化的重要手段。把动态页面生成静态HTML文件后续请求直接返回静态文件不需要执行PHP代码。phpclass StaticPageGenerator{private string $staticDir;private string $templateDir;public function __construct(string $staticDir /var/www/static){$this-staticDir rtrim($staticDir, /);$this-templateDir __DIR__ . /templates;if (!is_dir($this-staticDir)) {mkdir($this-staticDir, 0755, true);}}public function generate(string $pageName, array $data): string{$html $this-renderTemplate($pageName, $data);$path $this-staticDir . / . $pageName . .html;file_put_contents($path, $html, LOCK_EX);return $path;}public function renderTemplate(string $template, array $data): string{extract($data);ob_start();include $this-templateDir . / . $template . .php;return ob_get_clean();}public function serveStatic(string $pageName): bool{$path $this-staticDir . / . $pageName . .html;if (file_exists($path)) {readfile($path);return true;}return false;}public function batchGenerate(array $pages): void{foreach ($pages as $pageName $data) {$this-generate($pageName, $data);echo 生成: $pageName.html\n;}}public function cleanExpired(int $maxLifetime 86400): int{$cleaned 0;$files glob($this-staticDir . /*.html);foreach ($files as $file) {if (time() - filemtime($file) $maxLifetime) {unlink($file);$cleaned;}}return $cleaned;}}$generator new StaticPageGenerator();$generator-batchGenerate([index [title 首页, content 欢迎来到首页],about [title 关于我们, content 这是一段关于我们的介绍],]);echo 已清理过期页面: . $generator-cleanExpired() . \n;?文件缓存适用于中小型项目实现简单不需要额外依赖。但高并发场景下文件IO会成为瓶颈这时候应该用Redis或Memcached。