I have paragraph or words like: $title = "stack over flow is good site"
I want it in tags like : stack, over, flow , is, good, site
<? echo strtolower( $title); ?>
In php which function i use?
This line should work for you.
<? echo strtolower(str_replace(" ", ",", $title)); ?>
Or you can try
<? echo implode(', ', explode(" ", strtolower($title))); ?>