mysql 聯集查詢在資料庫裡測試時正確，通過php操作就不對了？

SQL語句如下：
"SELECT t.task_name,t.task_begin_p,t.task_end_p,t.task_end_r,p.proj_name from tasks as t inner join projects as p on t.task_project_id=p.proj_id where t.task_user_id=".$_SESSION['user_id']."order by t.task_begin_p ASC,t.task_end_p ASC;"

php代碼如下：

$link = mysqli_connect('localhost','root','root');$db = mysqli_select_db($link,'workon');mysqli_query($link,"set names 'utf8'"); $query = "SELECT t.task_name,t.task_begin_p,t.task_end_p,t.task_end_r,p.proj_name from tasks as t inner join projects as p on t.task_project_id=p.proj_id where t.task_user_id=".$_SESSION['user_id']."order by t.task_begin_p ASC,t.task_end_p ASC"; $data = mysqli_query($link,$query);while ($row = mysqli_fetch_assoc($data)) {};

返回錯誤如下：
Warning: mysqli_fetch_assoc() expects parameter 1 to be mysqli_result, boolean given in

回複內容：

SQL語句如下：
"SELECT t.task_name,t.task_begin_p,t.task_end_p,t.task_end_r,p.proj_name from tasks as t inner join projects as p on t.task_project_id=p.proj_id where t.task_user_id=".$_SESSION['user_id']."order by t.task_begin_p ASC,t.task_end_p ASC;"

php代碼如下：

$link = mysqli_connect('localhost','root','root');$db = mysqli_select_db($link,'workon');mysqli_query($link,"set names 'utf8'"); $query = "SELECT t.task_name,t.task_begin_p,t.task_end_p,t.task_end_r,p.proj_name from tasks as t inner join projects as p on t.task_project_id=p.proj_id where t.task_user_id=".$_SESSION['user_id']."order by t.task_begin_p ASC,t.task_end_p ASC"; $data = mysqli_query($link,$query);while ($row = mysqli_fetch_assoc($data)) {};

返回錯誤如下：
Warning: mysqli_fetch_assoc() expects parameter 1 to be mysqli_result, boolean given in

=".$_SESSION['user_id']."order by 這裡，看到了嗎？order by 前面沒空格。

大神就是大神~~~樓上正解，想評論來著，搞錯地方了

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