如何将for循环增加1以上？ [关闭]

Question

How do I print a series like this?

6,15,24,33,42.....1000

I have tried using a for loop like this, but can't work out how to get it to increment by 9 on each iteration.

for($i = 6; $i <= 1000; $i = 9)
{
    echo $i . ', ';
}

Answer 1

Quite simple really:-

for($i = 6; $i <= 1000; $i += 9){
    echo $i . ', ';
}
//If you have to finish the series with 1000, although it is not a part of the series:-
echo '1000';

See it working