<?php 
 
function  c
( $y , $s ) { for ( $d = $y * 365.25 ;++ $i < count ( $l = array_map ( date_create , $s ) ) ; ) $d += $l [ 0 ] -> diff ( $l [ $i ] ) -> days ; ( $l [ $i - 1 ] > $r = $l [ 0 ] -> add ( new  DateInterval
( P
. ceil ( $d / $i ) . D
) ) ) ?c
( $y , array_slice ( $s , 0 ,- 1 ) ) : print $r -> format ( 'Y/m/d' ) ; }  
c( 10 ,   [ '2000/01/01' ] ) ;                                            echo  "\n " ; 
c( 100 ,  [ '1975/03/05' ,  '1978/07/23' ,  '2008/11/12' ,  '2012/12/20' ] ) ;  echo  "\n " ; 
c( 100 ,  [ '1975/03/06' ,  '1978/07/23' ,  '2008/11/12' ,  '2012/12/20' ] ) ;  echo  "\n " ; 
c( 100 ,  [ '1975/03/09' ,  '1978/07/23' ,  '2008/11/12' ,  '2012/12/20' ] ) ;  echo  "\n " ; 
c( 100 ,  [ '1975/03/10' ,  '1978/07/23' ,  '2008/11/12' ,  '2012/12/20' ] ) ;  echo  "\n " ; 
c( 3 ,    [ '1990/08/01' ,  '1995/07/02' ] ) ;                              echo  "\n " ; 
c( 50 ,   [ '1975/03/05' ,  '1978/07/23' ,  '2008/11/12' ,  '2012/12/20' ] ) ;  echo  "\n " ; 
 
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