Delimit string by whitespaces

What would be the appropriate regex to delimit a string by all whitespaces? There can also be more than one whitespace between two token and it should ignore whitespaces at the end. What I have so far: ``` <?php $tags = "unread dev test1 "; $tagsArr = preg_split("/ +/", $tags); foreach ($tagsArr as $value) { echo $value . ";"; } ``` This gives me the following output: ``` "unread;dev;test1;;" ``` As you can see it doesn't ignore the whitespaces at the end because the correct output should be: ``` "unread;dev;test1;" ```