WordPress: List taxonomies and seperator

functions.php

<?php
// Get the tags.
$tags = get_the_tags();

// Count the total of tags.
$total_tags = count($tags);

// Set integer to 0.
// This is used to track at which item the loop is.
$i=0;

// Validate that there are more then 1 tag.
if($tags && ($total_tags > 1) ):

  // Loop trough all tags.
  foreach($tags as $tag):

    // Increase the integer.
    $i++;

    // Echo the tag name.
    echo $tag->name;

    // If $i is less then total of tags, add comma seperator.
    if($i < ($total_tags - 1) ):

      echo ', ';

    // If $i is equal to total of tags, and add a 'and' between the second to last item and last item.
    // Replace this with a subsitude in your native language.
    elseif($i < ($total_tags) ):

      echo " and ";

    endif;
  endforeach;

// There is only 1 tag.
else:
  if($tags):
    foreach($tags as $tag):
      echo $tag->name;
    endforeach;
  endif;
endif;
?>