Prepend character to each value in a delimited string

Question

I am trying to take a string like php,mysql,css
and turn it into #php #mysql #css

What I have so far:

$hashTagStr  = "php,mysql,css";
$hashTags = explode(",", $hashTagStr);

foreach($hashTags as $k => $v){
    $hashTagsStr = '';
    $hashTagsStr .= '#'.$v.' ';
}
echo $hashTagsStr;

Problem is it only prints #css

Answer 1

How about this:

$hashTagStr  = "php,mysql,css";
$hashTags = explode(",", $hashTagStr);
$hashTagStr = '#' . implode( ' #', $hashTags );

...or:

$hashTagStr  = "php,mysql,css";
$hashTagStr = '#' . str_replace( ',', ' #', $hashTagStr );