I have a php question?

[jtorii4]

I want the output to be

1
12
123
1234
12345

...and so on depending on the number of lines the user asks for all in .php format. PLEASE HELP. I know you have to use a for loop but how?

 

[Chris]

for($i=0;$i<$lines;$i++){
for($j=1;$j<$i;$j++){
echo $j;
}
echo "<br>";
}