PHP学习：YII框架批量插入数据的方法

public function insertSeveral($table, $array_columns)
{
 $sql = '';
 $params = array();
 $i = 0;
 foreach ($array_columns as $columns) {
  $names = array();
  $placeholders = array();
  foreach ($columns as $name => $value) {
   if (!$i) {
    $names[] = $this->_connection->quoteColumnName($name);
   }
   if ($value instanceof CDbExpression) {
    $placeholders[] = $value->expression;
    foreach ($value->params as $n => $v)
     $params[$n] = $v;
   } else {
    $placeholders[] = ':' . $name . $i;
    $params[':' . $name . $i] = $value;
   }
  }
  if (!$i) {
   $sql = 'INSERT INTO ' . $this->_connection->quoteTableName($table)
    . ' (' . implode(', ', $names) . ') VALUES ('
    . implode(', ', $placeholders) . ')';
  } else {
   $sql .= ',(' . implode(', ', $placeholders) . ')';
  }
  $i++;
 }
 return $this->setText($sql)->execute($params);
}
$rows = array(
   array('id' => 1, 'name' => 'John'),
   array('id' => 2, 'name' => 'Mark')
);
$command = Yii::app()->db->createCommand();
$command->insertSeveral('users', $rows);