database - how to insert array values in a single column in mysql with php? -

m dealing checkbox selection

<input type="checkbox" name="chk_group[]"  value="1"> <input type="checkbox" name="chk_group[]"  value="2"> <input type="checkbox" name="chk_group[]"  value="3"> <input type="checkbox" name="chk_group[]"  value="4"> 

here im getting values of checked checkboxes in array:

$ids = array(); foreach($_post['chk_group'] $val) { $ids[] = (int) $val; } echo $ids = implode(',', $ids); 

if check 2nd , 3rd checkbox [2,3] value in array $id. problem want store these values separately in db table column

table is:

product_attribute

• id
• a_id

i want insert values array in column a_id

id ------ a_id
1 ------- 2
2 ------- 3
how can use insert query store data in mysql table??

where have

implode(',', $ids) 

replace sql. example:

$db->query("insert product_attribute (a_id) values (" . implode('),(', $ids) . ")"); 

i leave casting loop sanitizes data.