Cainiao's question: small questions about PHP and MySQL

Cainiao's question: small questions about PHP and MySQL
What I want to achieve is
Order multiple dishes
Then select a box
Then click Submit Order
The unit price of the selected option is automatically added
Then assign the result to the cost of the selected box, that is, jiesuan
The PHP code is as follows:

 _ ModelExample1 = & FLEA: getSingleton ('Model _ Renwu_caidanguanli '); $ this-> _ modelExample2 = & FLEA: getSingleton ('Model _ Renwu_baoxiangguanli ');} function actiondiancai () {$ this-> authCheck ('9-3'); $ this-> _ edit ($ row);} function _ edit ($ arr) {$ title = 'food click';/* perform database operations * // * database query statement */$ SQL = "select * from renwu_caidanguanli where shoumaizhuangtai = 'sell '"; $ class_info1 = $ this-> _ modelExample1-> findBySql ($ SQL); $ temp = $ this-> _ ModelExample1-> execute ($ SQL);/* Display Data */$ smarty = & $ this-> _ getView (); /* the role of the added post is unknown */$ smarty-> assign ('class _ info1 ', $ class_info1 ); /* display the webpage template * // $ smarty-> display ("Renwu/caidanguanli. tpl "); $ title = 'box click '; /* perform database operations * // * database query statement */$ SQL = "select * from renwu_baoxiangguanli where baoxiangzhuangtai = 'idle '"; $ class_info2 = $ this-> _ modelExample2-> findBySql ($ SQL); $ temp = $ this-> _ modelExample2-> execute ($ SQL );/* Show the data */$ smarty = & $ this-> _ getView ();/* the added field is unknown */$ smarty-> assign ('class _ info2 ', $ class_info2);/* display the webpage template */$ smarty-> display ("Renwu/diancai. tpl ");} function actionChange () {// select $ B = 0 based on the selected menu; $ SQL = "select caipindanjia from renwu_caidanguanli where id = '{_ _ POST ['isover1']}'"; // dump ($ SQL ); // $ this-> _ modelExample-> execute ($ SQL); $ temp = $ this-> _ modelExample1-> findBySql ($ SQL ); // dump ($ temp); exit; $ a = $ temp [0] ['Caipindanjia ']; $ B = $ B + $ a; dump ($ B); exit; // price list of temporary dishes // $ SQL = "update renwu_baoxiangguanli set jiesuan = '$ a' where id =' {$ _ POST ['isover1']} '"; // $ temp = $ this-> _ modelExample1-> execute ($ SQL ); $ SQL = "update renwu_baoxiangguanli set baoxiangzhuangtai = 'in use 'Where id =' {$ _ POST ['isover2']} '"; // $ this-> _ modelExample-> execute ($ SQL); $ temp = $ this-> _ modelExample2-> execute ($ SQL ); // $ SQL = "delete from renwu_caidanguanli where Id = '{$ _ POST ['isdel']} '"; // $ this-> _ modelExample-> execute ($ SQL ); // $ temp = $ this-> _ modelExample-> execute ($ SQL); if ($ temp) {js_alert (null, "window. parent. showMsg ('saved successfully! ') ", $ This-> _ url ('diance');} // else die ('failed to save! ') ;}}?>

The tpl code is as follows:

The structure of the dish database is as follows:

The box database structure is as follows:

Reply to discussion (solution)

Click here
Select multiple dishes
Query time
$ SQL = "select caipindanjia from renwu_caidanguanli where id in (". join (',', $ _ POST ['isover1']). ")";

The box seems to be a single button.
The check button also works, but the bottom is valid. Prone to disputes

Click here
Select multiple dishes
Query time
$ SQL = "select caipindanjia from renwu_caidanguanli where id in (". join (',', $ _ POST ['isover1']). ")";

The box seems to be a single button.
The check button also works, but the bottom is valid. Prone to disputes

The box has been changed to single choice
You're right.
I did not consider

I tried your code
The result is the unit price of a random option.
Not sum

Click here
Select multiple dishes
Query time
$ SQL = "select caipindanjia from renwu_caidanguanli where id in (". join (',', $ _ POST ['isover1']). ")";

The box seems to be a single button.
The check button also works, but the bottom is valid. Prone to disputes

Thank you very much.
Solved
I checked it with dump.
I found my own problems
A for loop is made.
Then we implement
Thank you very much for the moderator