[CI代码解读] 告诉你为何libraries 方法引用命名规则需要大写

public function library($library, $params = NULL, $object_name = NULL)
{
   if (empty($library))
   {
      return $this;
   }
   elseif (is_array($library))
   {
      foreach ($library as $key => $value)
      {
         if (is_int($key))
         {
            $this->library($value, $params);
         }
         else
         {
            $this->library($key, $params, $value);
         }
      }

      return $this;
   }

   if ($params !== NULL && ! is_array($params))
   {
      $params = NULL;
   }

   $this->_ci_load_library($library, $params, $object_name);
   return $this;
}

$class = ucfirst($class);

// Is this a stock library? There are a few special conditions if so ...
if (file_exists(BASEPATH.'libraries/'.$subdir.$class.'.php'))
{
   return $this->_ci_load_stock_library($class, $subdir, $params, $object_name);
}

if (file_exists($path = $path.'libraries/'.$file_path.$library_name.'.php'))
{
   // Override
include_once($path);