PHP while while循环加2

Question

目前我的代码如下:

for ($i=0; $i<=($num_newlines - 1); $i++) 
{
$tweetcpitems->post('statuses/update', 
                    array('status' => wordFilter("The item $parts[$i]  has been released on Club Penguin. View it here:   http://clubpenguincheatsnow.com/tools/swfviewer/items.swf?id=$parts[$id]")));
sleep(90);
}

我想要做的是让"i ++"部分加两个而不是一个,但我该怎么做？请帮忙!

Answer 1

for ($i=0; $i<=($num_newlines - 1); $i+=2) {

Answer 2

$i++ : increment by one

$i+=2 : increment by two

$i+=3 : increment by three

等等..