Fatal error: Call to a member function count() on a non-object in 78user

Question

所以我正在尝试输出数据......而且它returns "Fatal error: Call to a member function count() on a non-object in"..早些时候它确实有效，所以我真的不明白现在发生了什么..有什么想法吗？

public function find($user = null) {
    $field = (is_numeric($user)) ? 'id' : 'username';
    $data = $this->_db->get('users', array($field, '=', $user));
    if(!$data->count()) {
        $this->_data = $data->first();
        return true;
    }
    return false;
}

$user = new User();
echo $user->data()->username;

Answer 1

假设 $data->count() returns 返回的行数：

    public function find($user = null) {
        if($user != null){

        $field = (is_numeric($user)) ? 'id' : 'username';
        $data = $this->_db->get('users', array($field, '=', $user));
        if($data){
        if($data->count() > 0) {
            $this->_data = $data->first();
            return true;
        }
      }
    }
        return false;
 }

Fatal error: Call to a member function count() on a non-object in 78user

Fatal error: Call to a member function count() on a non-object in 78user

php

count