Generate formatted number using php -


i want generate formatted number xxx/yy/zz. xxx= unique auto increment number. yy= current month. zz= current year.
when creating number **012/02/16**. after number should **013/02/16**. after new month should automatically showing **001/03/16**.

so pleas give me instructions develop number thank much

this code

$today_month= date('m');             $pre_month=  date("m",strtotime("-1 month"));             $today_year= date('y');               if(isset($pre_month)){                  $today_month= date('m');                 $pre_month=  date("m",strtotime("-1 month"));                 //echo $pre_month;                    $today_year= date('y');                 //$pre_year=  date("y",strtotime("-1 year"));                 //echo $today_year;                   $a = 1;                 $last_id= ++$a;                 $last_id_new= $last_id+1;                  $invid = str_pad($last_id_new, 3, '0', str_pad_left);                  $x= $invid;                 $ref_number = $x."/".$today_month."/".$today_year;                   //echo $ref_number;             }             else{                  $today_month= date('m');                 $pre_month=  date("m",strtotime("-1 month"));                 //echo $pre_month;                    $today_year= date('y');                 //$pre_year=  date("y",strtotime("-1 year"));                 //echo $today_year;                  $a= 0;                 $last_id= ++$a;                 $last_id_new= $last_id+1;                  $invid = str_pad($last_id_new, 3, '0', str_pad_left);                  $x= $invid;                 $ref_number = $x."/".$today_month."/".$today_year;                 //echo $ref_number;             } 


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