http_match_modified
    (PECL)
http_match_modified -- Match last modification
Description
bool 
http_match_modified ( [int timestamp [, bool for_range = FALSE]] )
   Matches the given unix timestamp against the clients "If-Modified-Since" 
   resp. "If-Unmodified-Since" HTTP headers.
  
Parameters
   
- timestamp
 
       Unix timestamp; current time, if omitted
      
- for_range
 
       If set to TRUE, the header usually used to validate HTTP ranges will be checked
      
 
  Return Values
   Returns TRUE if timestamp represents an earlier date than the header, else FALSE.