Hello Everyone

this is the code
Code:
$a=1;
$b=1;
while($a<=5)
{		
	while($b<=20)
{
 echo $b
}
$b++;
}
$a++;
}
and i want to print
1 1
1 2
1 3
1 4
2 5
2 6
2 7
2 8
3 9
3 10
3 11
3 12
4 13
4 14
4 15
4 16
5 17
5 18
...