当我删除最后一个逗号时，为什么会获得额外的空格？

Question

I used several different posts on this site to figure out how to remove the last comma in a string. Apparently it's a classic question, but what I can't figure out is why it's adding an extra white space before the comma and not after the comma as one would expect?

As always I've played around with the code but I can't figure out where the extra white space comes from, please help me I'm going blind!

<?php $comma = ""; ?><?php foreach ($tags as $tag) { ?>
<?php echo $comma; ?><a href="<?php echo $tag['href']; ?>">
<?php echo $tag['tag']; ?></a><?php $comma = ","; ?>

Answer 1

The blank space is due to the line break in your HTML after the <a> element opens.

A better output soution would be:

<?php
$total = count( $tags);
$x = 0;
foreach ( $tags as $tag ){
    $x++;
    echo '<a href="' . $tag['href'] . '">' . $tag['tag'] . '</a>';
    if ( $x < $total ) echo ',';
}
?>