results return incorrectly from PHP class query when processed by another function
以下工作:
1 2 | $user_list = new user_list(); $all_users_list = $user_list->getAllUsers(); |
以下内容不起作用,我不确定为什么不起作用:
1 | $user_list = new user_list(); |
以上返回:
1 |
参考类:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | class dbo extends mysqli { public function __construct(){ require('config_db.inc.php'); parent::__construct($db_host, $db_user, $db_pass, $db_name); if (mysqli_connect_error()) { die("Connect Error: (".mysqli_connect_errno().") -".mysqli_connect_error()); } } } class user_list extends user { var $table_name ="cms_users"; function __construct($group ="") { if ($group =="") { return $this->getAllUsers(); } else { $this->getUsersFromGroup($group); return $this->result; } } function getAllUsers() { $dbh = new dbo(); $sql ="SELECT * FROM {$this->table_name}"; return $dbh->query($sql); } function getUsersFromGroup($group) { $dbh = new dbo(); $sql ="SELECT * FROM {$this->table_name} WHERE group=$group"; return $dbh->query($sql); } } |
问题是变量名
1 2 3 4 5 6 7 8 9 | $user_list = new user_list(); // $user_list is now an object $user_list = $user_list->getAllUsers(); // $user_list is now a mysqli resource ... // line 59: code that expects $user_list to be a mysqli resource |
比较:
1 2 3 4 5 6 | $user_list = new user_list(); // $user_list is now an object ... // line 59: code that expects $user_list to be a mysqli resource |
不能从构造函数返回任何内容。
你在