How to store math expressions in a MySQL table and then do calculations with PHP?

Question

PHP

I need to store mathematical expressions in which field for each record in the table, and then sum them up using PHP
. For example,
ID| Title |Expression
where Expression can take the values ​​+1, -2, +5, -6 , that is, valid operands are [-,+]Integer. The task then to summarize these values ​​with grouping.
The first thing that comes in is a VARCHAR[8] field, that is, as a string.
1. Is there a more beautiful solution for storing mathematical operations in a table?
2. How then to sum up the field values ​​beautifully using PHP or SQL?

Answer 1

www.w3schools.com/sql/sql_func_sum.asp
Store simply as signed integers.

Answer 2

If the expression can only be strictly formatted as you wrote (-|+[0-9]), then why did signed int not suit you? `), or I misunderstood something...