php - the sum of entered number with old number in the database -

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i have 3 fields , table in database called "support"

name:<input type="text" name="name" id="name" value=""/> <br><br> serial:<input type="text" name="badge" id="badge" value=""/> <br><br> quantity:<input type="text" name="address" id="address" value=""/> <br><br>

if name , serial exists in database (the quantity field) can sum of entered number old number in database. example, quantity 5 insert value 6 quantity 5+6= 11.

how can ?

you can use simple sql query after parameters $_post:

update support set quantity = quantity + ? serial = ? , name = ?  # passing escaped parameters form

first parameter $_post['address'], second $_post['badge'] , third $_post['name']


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