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PHP- Adding And Subtracting Dates

Here’s how you add and subtract dates from one another. For example, this simple code can calculate what the date will be 2 weeks before or after 1998-08-14 (yyyy-mm-dd).

Subtracting days from a date
The following example will subtract 3 days from 1998-08-14. The result will be 1998-08-11.


$date = "1998-08-14";
$newdate = strtotime ( '-3 day' , strtotime ( $date ) ) ;
$newdate = date ( 'Y-m-j' , $newdate );

echo $newdate;
Subtracting Weeks from a date
The following example will subtract 3 weeks from 1998-08-14. The result will be 1998-07-24. Notice that the only difference in the code is the week statement.


$date = "1998-08-14";
$newdate = strtotime ( '-3 week' , strtotime ( $date ) ) ;
$newdate = date ( 'Y-m-j' , $newdate );

echo $newdate;
Subtracting Months from a date
The following example will subtract 3 months from 1998-08-14. The result will be 1998-05-14. Notice that the only difference in the code is the month statement.


$date = "1998-08-14";
$newdate = strtotime ( '-3 month' , strtotime ( $date ) ) ;
$newdate = date ( 'Y-m-j' , $newdate );

echo $newdate;
Subtracting Years from a date
The following example will subtract 3 years from 1998-08-14. The result will be 1995-08-14. Notice that the only difference in the code is the year statement.


$date = "1998-08-14";
$newdate = strtotime ( '-3 year' , strtotime ( $date ) ) ;
$newdate = date ( 'Y-m-j' , $newdate );

echo $newdate;
Adding days, months, weeks and years from a date
There isn’t really much difference from subtracting and adding dates. To add dates, just use any of the examples above and replace the negative (-) with a positive (+) e.g. ‘+3 weeks’

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Virus f Opyum Team

Symptoms :: 
Several processes running named f or i. 
Network choked
Apache Dead
Unknown entry  * * * * * root f Opyum Team in crontab

Investigate ::
Try to kill the f process and even root will be unable to kill it. Check file named f and i in /etc or /bin or /usr/sbin directory. Try to delete, the file f  will not delete.  Some unknown .jpg files will be there in the same folder. 

Solve :: The root is unable to delete the file f because of the immutable bit in f
To remove it use ses or chattr
Follow the below steps to remove it completely.....



remove the unknown .jpg files in system folders

#top
(kill process f) option k

#ses -i /bin/f
#rm /bin/f
#ses -i /etc/crontab
#vi /etc/crontab (and delete last line)
#reboot


Precautions ::  In my case the server was hacked bu Brute-force attack
So set a good password with a combination of upper,lower case letters and special characters.

Post your feedback or any issues you may face removing the virus.  Very less number of good threads are there explaining …