PHP/Mysql: optimize query - php

Question

I have the following script that retrieve numbers from 2 tables, make a sum, and the value is updated into a 3th table.
$query = "SELECT (SELECT SUM(net_amount) FROM fin_costos WHERE month='1' AND group_of_costos='general' AND year_analysis='2014' ) +
(SELECT SUM(net_amount) FROM em2_fin_costs WHERE month='1' AND group_of_costos='general' AND year_analysis='2014') AS total";
$result = mysqli_query($mysqli,$query);
while($row = mysqli_fetch_array($result)){$valor_final = $row['total']; }
$query_update="UPDATE fusion_analysis SET jan='$valor_final' WHERE year_for_analysis='2014' AND item_for_analysis='general' AND category='general'";
$result = mysqli_query($mysqli,$query_update);
I need to run the same script for each month of the year. Everything is exaclty the same except the variable 'month' that changes from 1 to 12 and the SET in UPDATE where the value is uploaded for each month ('jan','feb', 'mar'...etc)
I'm currently just copying and pasting the same script changing this few parameters but I believe there is a smarter way to do this in less lines of code I have

Answer 1

See date function of PHP:
$query = "SELECT (SELECT SUM(net_amount)"
. " FROM fin_costos"
. " WHERE month='".date('n')."'"
." AND group_of_costos='general' AND year_analysis='".date("Y")."' ) +"
."(SELECT SUM(net_amount) FROM em2_fin_costs WHERE month='".date('n')."'"
. " AND group_of_costos='general' AND year_analysis='".date("Y")."') AS total";
$query_update="UPDATE fusion_analysis"
. " SET `". strtolower(date('M'))."`='$valor_final'"
. " WHERE year_for_analysis='".date("Y")."'"
. " AND item_for_analysis='general'"
. " AND category='general'";
NOTE:
Y - A full numeric representation of a year, 4 digits like 2014
n - Numeric representation of a month, without leading zeros 1 - 12
M - A short textual representation of a month, three letters Jan through Dec
For month as short textual I've used the strtolower function to make it lowercase.
UPDATE
Based on OP comment:
for ($i = 1; $i <= 12; $i++) {
$query = "SELECT (SELECT SUM(net_amount)"
. " FROM fin_costos"
. " WHERE month='" . $i . "'"
. " AND group_of_costos='general' AND year_analysis='" . date("Y") . "' ) +"
. "(SELECT SUM(net_amount) FROM em2_fin_costs WHERE month='" . $i . "'"
. " AND group_of_costos='general' AND year_analysis='" . date("Y") . "') AS total";
$result = mysqli_query($mysqli, $query);
$row = mysqli_fetch_assoc($result);
$valor_final = $row['total'];
$monthName = strtolower(date('M', strtotime(date("Y") . "-" . str_pad($month,2, "0", STR_PAD_LEFT) . "-" . date("01") )));
$query_update = "UPDATE fusion_analysis"
. " SET `" . $monthName . "`=' " . $valor_final . "'"
. " WHERE year_for_analysis='" . date("Y") . "'"
. " AND item_for_analysis='general'"
. " AND category='general'";
mysqli_query($mysqli, $query_update);
}