{

if

(!

strcmp

(

$type

,'b'))

$res

=

date

("Y-m-d H:i:s",

strtotime

("-$sec second"));

if

(!

strcmp

(

$type

,'l'))

$res

=

date

("Y-m-d H:i:s",

strtotime

("+$sec second"));

return

 

$res

; 

}

//间隔几个星期之前或之后的时间
function

 GetDiffWeek(

$Week

,

$type

='l')

{

if

(!

strcmp

(

$type

,'b'))

$res

=

date

("Y-m-d H:i:s",

strtotime

("-$Week week"));

if

(!

strcmp

(

$type

,'l'))

$res

=

date

("Y-m-d H:i:s",

strtotime

("+$Week week"));

return

 

$res

; 

}

// 间隔几天之间的时间
function

 GetDiffDays(

$days

,

$type

='l')

{

if

(!

strcmp

(

$type

,'b'))

$res

=

date

("Y-m-d H:i:s",

strtotime

("-$days day"));

if

(!

strcmp

(

$type

,'l'))

$res

=

date

("Y-m-d H:i:s",

strtotime

("+$days day"));

return

 

$res

; 

}

//间隔几年之前或之后的时间
function

 GetDiffYears(

$year

,

$type

='l')

{

if

(!

strcmp

(

$type

,'b'))

$res

=

date

("Y-m-d H:i:s",

strtotime

("-$year year"));

if

(!

strcmp

(

$type

,'l'))

$res

=

date

("Y-m-d H:i:s",

strtotime

("+$year year"));

return

 

$res

; 

}