将逗号分隔的数据拆分为多行

Question

I want to modify table in my production server by extracting some column and put it into another table, the problem is the old column has multiple value separated by commas and in new table will be put in multiple records by query. i know the way like INSERT INTO user_emails(user_id, email) SELECT id, email FROM users but it would copy entire content of field.

table users (old)
-----------------------------------------------------
id  name  emails (removed)
-----------------------------------------------------
1   A     aaa@email.com, bbb@email.com
2   B     ccc@email.com, ddd@email.com, eee@email.com

table user_emails (new table)
---------------------------------
id  user_id  email
---------------------------------
1   1        aaa@email.com
2   1        bbb@email.com
3   2        ccc@email.com
4   2        ddd@email.com
5   2        eee@email.com

Any solution? Thank you

Answer 1

you should get fetch data from DB and store into array and then use explode() function to split the data

<?php
   $data=explode("," , $allEmails);
?>

now $data is convert into array like this

Array ( [0] => abc@g.com [1] => a@yahoo.com [2] => z@y.com )

finally you can insert into new table using insert query