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gmmktime    (PHP 3, PHP 4, PHP 5) gmmktime -- Get Unix timestamp for a GMT date Descriptionint  gmmktime ( [int hour [, int minute [, int second [, int month [, int day [, int year [, int is_dst]]]]]]] ) 
   Identical to mktime() except the passed parameters represents a 
   GMT date. gmmktime() internally uses mktime()
   so only times valid in derived local time can be used.
   
   Like mktime(), arguments may be left out in order
   from right to left, with any omitted arguments being set to the
   current corresponding GMT value.
   Parameters
    - hour
 
       The hour
       - minute
 
       The minute
       - second
 
       The second
       - month
 
       The month
       - day
 
       The day
       - year
 
       The year
       - is_dst
 
       Parameters always represent a GMT date so is_dst
       doesn't influence the result.
       
  
  Return Values
   Returns a integer Unix timestamp.
   Examples
    Example 1. gmmktime() on Windows boundary <?php
gmmktime(0, 0, 0, 1, 1, 1970); // valid in GMT and west, invalid in east
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