Adding variable filed and timestamp field - php

Question

I've got problem to adding timestamp with integer , I have start_date (timestamp) and month_pay . I want to add month of start_date with month.

eg

start_date = 2015-02-04 12:38:58 , month_pay = 1  
=> total =  2015-03-04

list($year, $month, $day) = array_values(date_parse($timestamp));
$total_month  = $month_pay + $month ;
echo $total_month

In this way , I just show Year & Month & Day , but this is not I want.

Answer 1

Maybe this is what you want?

$date = date_create('2015-02-04 12:38:58');
date_add($date, date_interval_create_from_date_string('30 days'));
// 1 month is not quite good duration / time interval
echo date_format($date, 'Y-m-d H:i:s');

The output would be: 2015-03-06 12:38:58

Change it to 28 days (for this year, or 1 month as suggested by @ fortune ) if you want it to be 4th March.

Answer 2

Assuming $timestamp is a string representing a date, and $month_pay are number of months you want to add to this date:

$month_pay = 1;   
$totalDate = strtotime($timestamp) + ($month_pay*86400);

now $totalDate is the timestamp of the final date.

echo date("Y-m-d", $totalDate);