time
    (PHP 3, PHP 4, PHP 5)
time -- Return current Unix timestamp
Description
int 
time ( void  )
   Returns the current time measured in the number of seconds since
   the Unix Epoch (January 1 1970 00:00:00 GMT).
  
Examples
   
Example 1. time() example 
<?php $nextWeek = time() + (7 * 24 * 60 * 60);                    // 7 days; 24 hours; 60 mins; 60secs echo 'Now:       '. date('Y-m-d') ."\n"; echo 'Next Week: '. date('Y-m-d', $nextWeek) ."\n"; ?>
 |  
 The above example will output 
something similar to: Now:       2005-03-30
Next Week: 2005-04-07  |  
  | 
  Notes
Tip: 
    Timestamp of the start of the request is available in
    $_SERVER['REQUEST_TIME'] since PHP 5.1.