关于Yii2优化的几点建议 [ 2.0 版本 ]

关于Yii2优化的几点建议 可先阅读此链接内容Yiichina

1. 写法优化

   • 查询条件尽量多写数组,若写入字符串会进行正则匹配.

      ->select(['id','name'])
      ->orderBy(['id' => SORT_DESC])
      ->groupBy(['id'])
     

   • model类查询尽量多使用数组

      $data = DemoModel::find()->asArray()->all();
      //或者(此处from写数组与上一点原理相同)
      $data = (new \yii\db\Query())->from([DemoModel::tableName()])->all();
     

   • 字符串加密,如不是特别强求尽量使用encryptByKey而不是encryptByPassword,本人用xhprof性能工具分析时发现encryptByPassword要比encryptByKey慢很多

      Yii::$app->security->encryptByKey($string, $key);
     

   • 自己写的Asset类,里面的静态文件放在web目录下直接访问,不在复制静态文件到web/asset目录,如果更新静态文件可添加静态文件版本号,减少文件读取次数.

      <?php
      namespace app\assets;
      use yii\web\AssetBundle;
      class DemoAssets extends AssetBundle
      {
       public $basePath = '@webroot';
       public $baseUrl = '@web';
       public $js = [
           'js/demo.min.js?v=1',
       ];
      }
     

2. 配置优化

   • 静态文件assetManager不要添加时间戳减少访问文件次数

      $config['components']['assetManager'] =[
       'appendTimestamp' => false, //默认为false
      ]
     

   • 数据库缓存表结构

      $config['db'] =[
       'class' => 'yii\db\Connection',
       'enableSchemaCache' => true,
      ];
     

   • session配置保存在内存中(可选)

      $config['components']['session'] = [
       'class' => 'yii\redis\Session',
       'keyPrefix'=>'user_',
       'redis' => [
           'hostname' => '127.0.0.1',
           'port' => 6379,
           'database' => 11,
           'password' => 'password',
       ]
      ];
     

3. 扩展优化

   • 修改日志组件为seaslog

      $config['components']['log'] = [
       'traceLevel' => YII_DEBUG ? 3 : 0,
       'flushInterval' => 1,
       'targets' => [
           [
               'class' => 'app\components\log\SeasLogTarget',
               'exportInterval' => 1,
               'levels' => ['error'],//,'warning', 'info'
               'maxFileSize' => 1024 * 2,
               'maxLogFiles' => 20,
           ],
       ],
      ],
      //seaslog类
      <?php
      namespace app\components\log;
      use Yii;
      use yii\helpers\VarDumper;
      use yii\log\FileTarget;
      use yii\log\Logger;
      class SeasLogTarget extends FileTarget
      {
       public $logPath;
       private $levelName;
       /**
        * @var \SeasLog
        */
       protected $seasLog;
       /**
        * init
        * @throws \yii\base\InvalidConfigException
        */
       public function init()
       {
           if (empty($this->logPath)) {
               $this->logPath = Yii::$app->getRuntimePath().DIRECTORY_SEPARATOR;
           } else {
               $this->logPath = Yii::getAlias($this->logPath);
           }
         
           $this->logFile = $this->logPath.DIRECTORY_SEPARATOR.'logs'.DIRECTORY_SEPARATOR.date('Ymd').'.log';
           $this->seasLog = Yii::createObject('SeasLog');
           $this->seasLog->setBasePath($this->logPath);
           $this->seasLog->setLogger('logs');
           parent::init();
       }
         
       public function export()
       {
           if ($this->enableRotation && @filesize($this->logFile) > $this->maxFileSize * 1024) {
               $this->rotateFiles();
           }
           foreach ($this->messages as $text) {
               $text = $this->formatMessage($text);
               $this->seasLog->log($this->levelName, $text);
           }
       }
         
       /**
        * formatMessage
        * @param array $message
        * @return string
        */
       public function formatMessage($message)
       {
           list($text, $level, $category) = $message;
           $this->levelName = Logger::getLevelName($level);
           if (!is_string($text)) {
               if ($text instanceof \Throwable || $text instanceof \Exception) {
                   $text = (string) $text;
               } else {
                   $text = VarDumper::export($text);
               }
           }
           $traces = [];
           if (isset($message[4])) {
               foreach ($message[4] as $trace) {
                   $traces[] = "in {$trace['file']}:{$trace['line']}";
               }
           }
           $prefix = $this->getMessagePrefix($message);
           return "{$prefix}[$this->levelName][$category] $text"
               .(empty($traces) ? '' : "\n    ".implode("\n    ", $traces));
       }
      }
     

   • 修改cache组件为内存

      //MemCache 详细配置源码内有注释
      $config['components']['cache'] = [
       'class' => 'yii\caching\MemCache'
      ];
      //yii2-redis包(https://packagist.org/packages/yiisoft/yii2-redis)
      $config['components']['cache'] = [
       'class' => 'yii\redis\Connection',
           'hostname' => '127.0.0.1',
           'port' => 6379,
           'database' => 0,
      ];
      //yac(https://github.com/laruence/yac)鸟哥写的PHP共享和无锁内存用户数据缓存
      $config['components']['cache'] = [
       'class' => 'app\components\cache\YacCache',
       'prefix' => 'yii2'
      ];
      //yac cache组件代码
      <?php
      namespace app\components\cache;
      use Yii;
      use Yac;
      use yii\caching\Cache;
      class YacCache extends Cache
      {
       /**
        * @var Yac
        */
       private $yac;
       /**
        * @var string
        */
       public $prefix='';
         
       public function init()
       {
           parent::init();
           $this->yac = new Yac($this->prefix);
       }
     
       /**
        * @param mixed $key
        * @return bool
        */
       public function exists($key)
       {
           $key = $this->buildKey($key);
           $value = $this->getValue($key);
           return $value !== false;
       }
     
       /**
        * @param string $key
        * @return string|bool
        */
       protected function getValue($key)
       {
           return $this->yac->get($key);
       }
     
       /**
        * @param array $keys
        * @return array
        */
       protected function getValues($keys)
       {
           return $this->yac->get($keys);
       }
     
       /**
        * @param string $key
        * it could be something else.
        * @param int $duration
        * @return bool
        */
       protected function setValue($key, $value, $duration)
       {
           return $this->yac->set($key, $value, $duration);
       }
         
       /**
        * @param array $data
        * @param int $duration
        * @return array
        */
       protected function setValues($data, $duration)
       {
           return $this->yac->set($data,$duration);
       }
         
       /**
        * @param string $key
        * @param mixed $value
        * @param int $duration
        * @return bool
        */
       protected function addValue($key, $value, $duration)
       {
           return $this->yac->set($key, $value, $duration);
       }
         
       /**
        * @param array $data
        * @param int $duration
        * @return array
        */
       protected function addValues($data, $duration)
       {
           return $this->yac->set($data, $duration);
       }
         
       /**
        * @param string $key
        * @return bool
        */
       protected function deleteValue($key)
       {
           return $this->yac->delete($key);
       }
         
       /**
        * @return bool
        */
       protected function flushValues()
       {
           return $this->yac->flush();
       }
      }
     

   • 使用yaconf扩展配置文件

      // web/index.php
      //此处配置文件里不要写回调函数
      function getAppConfig(){
       //高级版
       return yii\helpers\ArrayHelper::merge(
           require(__DIR__ . '/../../common/config/main.php'),
           require(__DIR__ . '/../../common/config/main-local.php'),
           require(__DIR__ . '/../config/main.php'),
           require(__DIR__ . '/../config/main-local.php')
       );
       //基础版
       //return require __DIR__ . '/../config/web.php';
      }
      if(extension_loaded('yaconf')){
       /**
       * 使用此函数把index.php的配置数组转yaconf配置文件
       * arr2ini
       * @param array  $config
       * @param string $parent
       * @param int    $level
       * @return string
       */
       function arr2ini(array $config, $parent = '',$level=0){
           $out = '';
           foreach ($config as $key => $value) {
               if (is_array($value)) {
                   $level++;
                   if($level==0){
                       $out .= '[' . $key . ']' . PHP_EOL;
                       $sec='';
                   }else{
                       if(empty($parent)){
                           $sec = $key.'.';
                       }else{
                           $sec = $parent.$key.'.';
                       }
                   }
                   $out .= arr2ini($value, $sec,$level);
               } else {
                   if(is_numeric($value)){
                       $out .= $parent."$key=$value" . PHP_EOL;
                   }elseif(is_bool($value)){
                       $out .= $parent."$key=".($value?1:0) . PHP_EOL;
                   }else{
                       $out .= $parent."$key='$value'" . PHP_EOL;
                   }
                   $level=0;
               }
           }
           return $out;
       }
       if(empty($config = Yaconf::get("demo"))){
           $config = getAppConfig();
           file_put_contents('PATH/demo.ini',arr2ini($config));
       }
      }
      if(empty($config)){
       $config = getAppConfig();
      }
      (new yii\web\Application($config))->run();
     

4. composer.json配置镜像仓库加速下载
   • 修改repositories配置

     "repositories": {
       "0": {
           "type": "composer",
           "url": "https://asset-packagist.cn"
       },
       "packagist": {
           "type": "composer",
           "url": "https://mirrors.aliyun.com/composer/"
       }
     }