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Home php教程 PHP開發(fā) YiiBase automatic loading class and reference file method analysis (autoload) in Yii2

YiiBase automatic loading class and reference file method analysis (autoload) in Yii2

Dec 24, 2016 am 09:06 AM

本文實(shí)例分析了Yii2中YiiBase自動(dòng)加載類、引用文件的方法。分享給大家供大家參考,具體如下:

在Yii2中這個(gè)函數(shù)是用來(lái)加載類的,沒(méi)有直接引用文件的相關(guān)實(shí)現(xiàn)。但是這個(gè)也可以用來(lái)引用文件。

public static function autoload($className)
{
   /*
    * $classMap是一個(gè)name-value數(shù)組,
    * name為類的名稱,
    * value為這個(gè)類的文件路徑,其中路徑可包含別名
    *
    * 首先在$classMap中查找是否設(shè)置了類別名路徑
    */
  if (isset(static::$classMap[$className])) {
   $classFile = static::$classMap[$className];
   //如果路徑是別名,獲取別名路徑
   if ($classFile[0] === '@') {
    $classFile = static::getAlias($classFile);
   }
  //如果$className以"\"開頭,如:'\a\b\MyClass'
  //則會(huì)生成別名 '@a/b/MyClass.php',然后獲取對(duì)應(yīng)的別名路徑。
  } elseif (strpos($className, '\\') !== false) {
   $classFile = static::getAlias('@' . str_replace('\\', '/', $className) . '.php', false);
   if ($classFile === false || !is_file($classFile)) {
    return;
   }
  } else {
   return;
  }
  //引用文件
  include($classFile);
  //如果debug,并且類不存在....
  //則異常
  //所以 在關(guān)閉debug的情況下 也是可以加載文件的
  if (YII_DEBUG && !class_exists($className, false) && !interface_exists($className, false) && !trait_exists($className, false)) {
   throw new UnknownClassException("Unable to find '$className' in file: $classFile. Namespace missing?");
  }
}


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