需要获取特定月份中所有日期的列表

if i just give input ex: Jan i need to get all dates in Jan

2013-01-01
2013-01-07
....
...
2013-07-31

Can anyone suggest me with any formula or code will be helpfull

Try this:

$totalDays = date('t');    
for( $i=1; $i<= $totalDays; $i++)
 $dates[]= date('Y') . "-". date('m'). "-". str_pad($i,2,'0', STR_PAD_LEFT); 
var_dump($dates);