i want to display numbers only from 01 to 12

How to write a loop

<?php  
for($a=0; $a<10; $a++)  
 {   
   for($b=0; $b<10; $b++)  
      {  
         echo $a.$b.", ";   
      }  
 }   
?>  

I do not know whether is in your server php online

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without the php tag

for($a=0; $a<10; $a++)
{
for($b=0; $b<10; $b++)
{
echo $a.$b."<br>\n";
}
} 

your grind count on 0 to 99

00<br>
01<br>
02<br>
03<br>
04<br>
05<br>
06<br>
07<br>
08<br>
09<br>
10<br>
11<br>
12<br>
13<br>
14<br>
15<br>
16<br>
17<br>
18<br>
19<br>
20<br>
21<br>
22<br>
23<br>
24<br>
25<br>
26<br>
27<br>
28<br>
29<br>
30<br>
31<br>
32<br>
33<br>
34<br>
35<br>
36<br>
37<br>
38<br>
39<br>
40<br>
41<br>
42<br>
43<br>
44<br>
45<br>
46<br>
47<br>
48<br>
49<br>
50<br>
51<br>
52<br>
53<br>
54<br>
55<br>
56<br>
57<br>
58<br>
59<br>
60<br>
61<br>
62<br>
63<br>
64<br>
65<br>
66<br>
67<br>
68<br>
69<br>
70<br>
71<br>
72<br>
73<br>
74<br>
75<br>
76<br>
77<br>
78<br>
79<br>
80<br>
81<br>
82<br>
83<br>
84<br>
85<br>
86<br>
87<br>
88<br>
89<br>
90<br>
91<br>
92<br>
93<br>
94<br>
95<br>
96<br>
97<br>
98<br>
99<br>
for($i=1; $i<=12; $i++){
    echo str_pad($i, 2, "0", STR_PAD_LEFT)."<br/>";
    }
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