foreach le alınan veriler arasına işaret koymak ?

<?php
$count = count(get_the_category());
$i = 0;
foreach((get_the_category()) as $category) {
if ($count == ($i - 1)) {
echo $category->cat_name . ' ';
} else {
echo $category->cat_name . ',';
}
$i++
}
?>

 
<?php
$i = 0; 
$len = count(get_the_category());
foreach((get_the_category()) as $category) {
if ($i == $len - 1){
echo $category->cat_name' ';
}
else{
echo $category->cat_name . ', ';
}
$i++;
}
?>

<?php
foreach((get_the_category()) as $category) {
echo $category->cat_name . ' ';
}
?>

foreach((get_the_category()) as $category)  $result[] = $category->cat_name;
echo implode(', ',$result);

unset($result);