php - how to save variable as array into database -

how can save array database string

 col1 |  col2 ------------------- 1    | array(1,2) ------------------- 2    | array(6,9) 

all value in array related together

use serialize() , unserialize()

http://php.net/manual/en/function.serialize.php

http://php.net/manual/en/function.unserialize.php

your data this: a:2:{i:0;i:1;i:1;i:2;}