array(0) {
}
<br />
<b>Warning</b>:  Undefined array key "class_name" in <b>/home/jaehoonk/public_html/schedule_update.php</b> on line <b>22</b><br />
<br />
<b>Warning</b>:  Undefined array key "date" in <b>/home/jaehoonk/public_html/schedule_update.php</b> on line <b>23</b><br />
<br />
<b>Warning</b>:  Undefined array key "start_time" in <b>/home/jaehoonk/public_html/schedule_update.php</b> on line <b>24</b><br />
<br />
<b>Warning</b>:  Undefined array key "end_time" in <b>/home/jaehoonk/public_html/schedule_update.php</b> on line <b>25</b><br />
<br />
<b>Warning</b>:  Undefined array key "location" in <b>/home/jaehoonk/public_html/schedule_update.php</b> on line <b>26</b><br />
<br />
<b>Warning</b>:  Undefined array key "type" in <b>/home/jaehoonk/public_html/schedule_update.php</b> on line <b>27</b><br />
<br />
<b>Warning</b>:  Undefined array key "id" in <b>/home/jaehoonk/public_html/schedule_update.php</b> on line <b>28</b><br />
<hr>
UPDATE schedule
SET class_name = '',
    date = '',
    start_time = '',
    end_time = '',
    location_id = ,
    type_id = 
WHERE class_id = 
<hr>RESPONSE: <hr>DB ERROR!!!!<br> You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '
    type_id = 
WHERE class_id =' at line 6<hr>