当我在 PHP 代码中调用 GetExactTeacherAppViaId_contr 函数时，为什么我的 Ajax 响应无法正常工作？

Question

'my error2: ' 正确记录并且函数 'GetExactTeacherAppViaId_contr' 正常工作。但问题是只要此行存在，Ajax 响应就无法正常工作： $teachers = $teacher->GetExactTeacherAppViaId_contr($dbh, $teacherId);

只有当我删除它时，响应才能正常工作，但是日志或其他任何地方都没有错误。

if (substr($userId, 0, 1) == 't') {
    try {
        $userIs = 'teacher';
        $teacherId = $userId;
        $teachers = $teacher->GetExactTeacherAppViaId_contr($dbh, $teacherId);
        error_log("my error2 :" . $teachers[0]['Email']);

        echo json_encode(array(
            'test' => $userIs,
            'userIs' => $userIs,
            'teacherFirstName' => $teachers[0]['FirstName'],
            'teacherLastName' => $teachers[0]['LastName'],
            'teacherEmail' => $teachers[0]['Email'],
            'teacherStatus' => $teachers[0]['Status'],
            'suggestedUserName' => $teachers[0]['FirstName'] . ' ' . $teachers[0]['LastName']
        ));
    } catch (Exception $e) {
        // Handle the exception and log or display an error message
        error_log("Exception: " . $e->getMessage());
    }
}

我尝试编写错误日志并简化请求和响应，但也是同样的问题。