PHP 处理数组 array_map 比 foreach 更省内存一些 作者: Chuwen 时间: 2021-03-24 分类: PHP 评论 ## 序言 最近写代码一直考虑用最优的方法写✍ **个人拙见，如果错误，欢迎指正** ## 测试代码 > 测试环境：PHP 7.4.12 ( NTS Visual C++ 2017 x64 ) > 主要测试将数组里的 JSON 解码成数组，看需要花费多少内存 ```php <?php //随机生成一些测试数据 $arr = []; $use = []; for ($i = 0; $i < 100; $i++) { $arr[] = randJson(); } $arr2 = $arr; //foreach 测试代码开始 $use['start'] = memory_usage(); foreach ($arr as &$item) { $item = json_decode($item, true); } $use['end'] = memory_usage(); print_r($use); //foreach 测试代码结束 echo "华丽的分割线" . PHP_EOL . PHP_EOL; //array_map 测试代码开始 $use['start'] = memory_usage(); $arr2 = array_map(function ($item) { return json_decode($item, true); }, $arr2); $use['end'] = memory_usage(); print_r($use); //array_map 测试代码结束 function memory_usage() { $memory = (!function_exists('memory_get_usage')) ? '0' : round(memory_get_usage() / 1024 / 1024, 2) . 'MB'; return $memory; } function randJson() { return json_encode([ 'time' => time() . uniqid(), 'mtime' => microtime(true), 'uuid' => uniqid() ], JSON_UNESCAPED_UNICODE); } ``` ## 运行结果 > 时间基本上一致，故未作测试 > > `array_map` 比 `foreach` 确实更节省内存 ``` 使用的 foreach，内存使用量 0.07MB Array ( [start] => 0.41MB [end] => 0.48MB ) 使用的 array_map，内存使用量 0.03MB Array ( [start] => 0.48MB [end] => 0.51MB ) ```
npm run watch 报错：Windows 64-bit with Unsupported runtime (83) 作者: Chuwen 时间: 2021-03-19 分类: Node.js 评论 ## Node.js 和 npm 版本信息 ```log C:\Users\hello>node -v v14.16.0 C:\Users\hello>npm -v 6.14.11 ``` ## 报错信息 主要的报错信息：`Module build failed: Error: Node Sass does not yet support your current environment: Windows 64-bit with Unsupported runtime (83)` ```log ERROR in ./node_modules/css-loader??ref--8-2!./node_modules/postcss-loader/lib??postcss!./node_modules/resolve-url-loader??ref--8-4!./node_modules/sass-loader/lib/loader.js??ref--8-5!./resources/assets/sass/app.scss Module build failed: Error: Node Sass does not yet support your current environment: Windows 64-bit with Unsupported runtime (83) For more information on which environments are supported please see: https://github.com/sass/node-sass/releases/tag/v4.12.0 at module.exports (E:\xxxx\node_modules\node-sass\lib\binding.js:13:13) at Object.<anonymous> (E:\xxxx\node_modules\node-sass\lib\index.js:14:35) at Module._compile (internal/modules/cjs/loader.js:1063:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10) at Module.load (internal/modules/cjs/loader.js:928:32) at Function.Module._load (internal/modules/cjs/loader.js:769:14) at Module.require (internal/modules/cjs/loader.js:952:19) at require (internal/modules/cjs/helpers.js:88:18) at Object.<anonymous> (E:\xxxx\node_modules\sass-loader\lib\loader.js:3:14) at Module._compile (internal/modules/cjs/loader.js:1063:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10) at Module.load (internal/modules/cjs/loader.js:928:32) at Function.Module._load (internal/modules/cjs/loader.js:769:14) at Module.require (internal/modules/cjs/loader.js:952:19) at require (internal/modules/cjs/helpers.js:88:18) at loadLoader (E:\xxxx\node_modules\loader-runner\lib\loadLoader.js:18:17) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:169:2) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:165:10) at E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:176:18 at loadLoader (E:\xxxx\node_modules\loader-runner\lib\loadLoader.js:47:3) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:169:2) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:165:10) at E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:176:18 at loadLoader (E:\xxxx\node_modules\loader-runner\lib\loadLoader.js:47:3) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:169:2) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:165:10) at E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:176:18 at loadLoader (E:\xxxx\node_modules\loader-runner\lib\loadLoader.js:47:3) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:169:2) at runLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:365:2) @ ./resources/assets/sass/app.scss 4:14-266 @ multi ./resources/assets/js/app.js ./resources/assets/sass/app.scss ERROR in ./resources/assets/sass/app.scss Module build failed: ModuleBuildError: Module build failed: Error: Node Sass does not yet support your current environment: Windows 64-bit with Unsupported runtime (83) For more information on which environments are supported please see: https://github.com/sass/node-sass/releases/tag/v4.12.0 at module.exports (E:\xxxx\node_modules\node-sass\lib\binding.js:13:13) at Object.<anonymous> (E:\xxxx\node_modules\node-sass\lib\index.js:14:35) at Module._compile (internal/modules/cjs/loader.js:1063:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10) at Module.load (internal/modules/cjs/loader.js:928:32) at Function.Module._load (internal/modules/cjs/loader.js:769:14) at Module.require (internal/modules/cjs/loader.js:952:19) at require (internal/modules/cjs/helpers.js:88:18) at Object.<anonymous> (E:\xxxx\node_modules\sass-loader\lib\loader.js:3:14) at Module._compile (internal/modules/cjs/loader.js:1063:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10) at Module.load (internal/modules/cjs/loader.js:928:32) at Function.Module._load (internal/modules/cjs/loader.js:769:14) at Module.require (internal/modules/cjs/loader.js:952:19) at require (internal/modules/cjs/helpers.js:88:18) at loadLoader (E:\xxxx\node_modules\loader-runner\lib\loadLoader.js:18:17) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:169:2) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:165:10) at E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:176:18 at loadLoader (E:\xxxx\node_modules\loader-runner\lib\loadLoader.js:47:3) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:169:2) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:165:10) at E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:176:18 at loadLoader (E:\xxxx\node_modules\loader-runner\lib\loadLoader.js:47:3) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:169:2) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:165:10) at E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:176:18 at loadLoader (E:\xxxx\node_modules\loader-runner\lib\loadLoader.js:47:3) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:169:2) at runLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:365:2) at E:\xxxx\node_modules\webpack\lib\NormalModule.js:195:19 at E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:367:11 at E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:172:11 at loadLoader (E:\xxxx\node_modules\loader-runner\lib\loadLoader.js:32:11) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:169:2) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:165:10) at E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:176:18 at loadLoader (E:\xxxx\node_modules\loader-runner\lib\loadLoader.js:47:3) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:169:2) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:165:10) at E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:176:18 at loadLoader (E:\xxxx\node_modules\loader-runner\lib\loadLoader.js:47:3) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:169:2) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:165:10) at E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:176:18 at loadLoader (E:\xxxx\node_modules\loader-runner\lib\loadLoader.js:47:3) at iteratePitchingLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:169:2) at runLoaders (E:\xxxx\node_modules\loader-runner\lib\LoaderRunner.js:365:2) at NormalModule.doBuild (E:\xxxx\node_modules\webpack\lib\NormalModule.js:182:3) at NormalModule.build (E:\xxxx\node_modules\webpack\lib\NormalModule.js:275:15) at Compilation.buildModule (E:\xxxx\node_modules\webpack\lib\Compilation.js:157:10) at E:\xxxx\node_modules\webpack\lib\Compilation.js:460:10 at E:\xxxx\node_modules\webpack\lib\NormalModuleFactory.js:243:5 at E:\xxxx\node_modules\webpack\lib\NormalModuleFactory.js:94:13 at E:\xxxx\node_modules\tapable\lib\Tapable.js:268:11 at NormalModuleFactory.<anonymous> (E:\xxxx\node_modules\webpack\lib\CompatibilityPlugin.js:52:5) at NormalModuleFactory.applyPluginsAsyncWaterfall (E:\xxxx\node_modules\tapable\lib\Tapable.js:272:13) at E:\xxxx\node_modules\webpack\lib\NormalModuleFactory.js:69:10 at E:\xxxx\node_modules\webpack\lib\NormalModuleFactory.js:196:7 at processTicksAndRejections (internal/process/task_queues.js:75:11) @ ./resources/assets/sass/app.scss @ multi ./resources/assets/js/app.js ./resources/assets/sass/app.scss ``` ## 解决方案 > 参考：https://github.com/microsoft/PartsUnlimited/issues/134#issuecomment-361014259 重新构建 `node-sass` 包即可解决： > npm rebuild 命令参考：https://www.npmjs.cn/cli/rebuild/ ```log npm rebuild node-sass ```
npm install 报错：Error: Can't find Python executable "python", you can set the PYTHON env variable 及解决办法 作者: Chuwen 时间: 2021-03-19 分类: JavaScript 评论 # 解决办法 > Windows 10 快速以管理员身份打开 PowerShel 方法：`Win + X`，然后按 `A` 键即可 使用 **管理员身份** 打开 `PowerShell`，然后运行以下命令即可： ```shell npm install --global --production windows-build-tools ```