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<?php |
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// +---------------------------------------------------------------------- |
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// | ThinkPHP [ WE CAN DO IT JUST THINK ] |
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// +---------------------------------------------------------------------- |
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// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved. |
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// +---------------------------------------------------------------------- |
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 ) |
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// +---------------------------------------------------------------------- |
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// | Author: liu21st <[email protected]> |
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// +---------------------------------------------------------------------- |
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declare (strict_types = 1); |
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namespace think\session\driver; |
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use Closure; |
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use Exception; |
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use FilesystemIterator; |
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use Generator; |
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use SplFileInfo; |
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use think\App; |
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use think\contract\SessionHandlerInterface; |
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/** |
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* Session 文件驱动 |
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*/ |
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class File implements SessionHandlerInterface |
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{ |
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protected $config = [ |
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'path' => '', |
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'expire' => 1440, |
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'prefix' => '', |
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'data_compress' => false, |
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'gc_probability' => 1, |
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'gc_divisor' => 100, |
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]; |
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public function __construct(App $app, array $config = []) |
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{ |
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$this->config = array_merge($this->config, $config); |
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if (empty($this->config['path'])) { |
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$this->config['path'] = $app->getRootPath() . 'runtime' . DIRECTORY_SEPARATOR . 'session' . DIRECTORY_SEPARATOR; |
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} elseif (substr($this->config['path'], -1) != DIRECTORY_SEPARATOR) { |
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$this->config['path'] .= DIRECTORY_SEPARATOR; |
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} |
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$this->init(); |
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} |
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/** |
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* 打开Session |
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* @access protected |
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* @throws Exception |
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*/ |
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protected function init(): void |
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{ |
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try { |
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!is_dir($this->config['path']) && mkdir($this->config['path'], 0755, true); |
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} catch (\Exception $e) { |
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// 写入失败 |
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} |
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// 垃圾回收 |
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if (random_int(1, $this->config['gc_divisor']) <= $this->config['gc_probability']) { |
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$this->gc(); |
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} |
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} |
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/** |
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* Session 垃圾回收 |
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* @access public |
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* @return void |
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*/ |
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public function gc(): void |
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{ |
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$lifetime = $this->config['expire']; |
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$now = time(); |
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$files = $this->findFiles($this->config['path'], function (SplFileInfo $item) use ($lifetime, $now) { |
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return $now > $item->getMTime() + $lifetime; |
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}); |
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foreach ($files as $file) { |
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$this->unlink($file->getPathname()); |
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} |
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} |
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/** |
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* 查找文件 |
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* @param string $root |
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* @param Closure $filter |
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* @return Generator |
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*/ |
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protected function findFiles(string $root, Closure $filter) |
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{ |
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$items = new FilesystemIterator($root); |
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/** @var SplFileInfo $item */ |
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foreach ($items as $item) { |
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if ($item->isDir() && !$item->isLink()) { |
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yield from $this->findFiles($item->getPathname(), $filter); |
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} else { |
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if ($filter($item)) { |
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yield $item; |
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} |
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} |
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} |
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} |
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/** |
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* 取得变量的存储文件名 |
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* @access protected |
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* @param string $name 缓存变量名 |
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* @param bool $auto 是否自动创建目录 |
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* @return string |
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*/ |
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protected function getFileName(string $name, bool $auto = false): string |
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{ |
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if ($this->config['prefix']) { |
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// 使用子目录 |
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$name = $this->config['prefix'] . DIRECTORY_SEPARATOR . 'sess_' . $name; |
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} else { |
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$name = 'sess_' . $name; |
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} |
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$filename = $this->config['path'] . $name; |
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$dir = dirname($filename); |
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if ($auto && !is_dir($dir)) { |
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try { |
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mkdir($dir, 0755, true); |
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} catch (\Exception $e) { |
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// 创建失败 |
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} |
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} |
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return $filename; |
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} |
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/** |
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* 读取Session |
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* @access public |
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* @param string $sessID |
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* @return string |
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*/ |
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public function read(string $sessID): string |
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{ |
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$filename = $this->getFileName($sessID); |
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if (is_file($filename) && filemtime($filename) >= time() - $this->config['expire']) { |
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$content = $this->readFile($filename); |
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if ($this->config['data_compress'] && function_exists('gzcompress')) { |
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//启用数据压缩 |
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$content = gzuncompress($content); |
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} |
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return $content; |
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} |
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return ''; |
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} |
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/** |
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* 写文件(加锁) |
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* @param $path |
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* @param $content |
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* @return bool|int |
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*/ |
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protected function writeFile($path, $content) |
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{ |
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return (bool) file_put_contents($path, $content, LOCK_EX); |
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} |
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/** |
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* 读取文件内容(加锁) |
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* @param $path |
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* @return string |
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*/ |
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protected function readFile($path): string |
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{ |
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$contents = ''; |
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$handle = fopen($path, 'rb'); |
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if ($handle) { |
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try { |
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if (flock($handle, LOCK_SH)) { |
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clearstatcache(true, $path); |
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$contents = fread($handle, filesize($path) ?: 1); |
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flock($handle, LOCK_UN); |
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} |
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} finally { |
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fclose($handle); |
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} |
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} |
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return $contents; |
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} |
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/** |
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* 写入Session |
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* @access public |
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* @param string $sessID |
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* @param string $sessData |
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* @return bool |
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*/ |
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public function write(string $sessID, string $sessData): bool |
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{ |
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$filename = $this->getFileName($sessID, true); |
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$data = $sessData; |
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if ($this->config['data_compress'] && function_exists('gzcompress')) { |
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//数据压缩 |
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$data = gzcompress($data, 3); |
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} |
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return $this->writeFile($filename, $data); |
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} |
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/** |
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* 删除Session |
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* @access public |
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* @param string $sessID |
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* @return bool |
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*/ |
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public function delete(string $sessID): bool |
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{ |
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try { |
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return $this->unlink($this->getFileName($sessID)); |
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} catch (\Exception $e) { |
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return false; |
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} |
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} |
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/** |
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* 判断文件是否存在后,删除 |
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* @access private |
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* @param string $file |
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* @return bool |
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*/ |
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private function unlink(string $file): bool |
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{ |
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return is_file($file) && unlink($file); |
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} |
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} |
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