[WordPress] Writing Loops in PHP

00-for-loops.php

<?php

// Setup the array to store the tag names.
$tagNames = [];

// Iterate through all of the tags.
$tags = get_the_tags();
for ($i = 0; $i < count($tags); $i++) {
  $currentTag = $tags[$i];
  
  // Only add names that have not been added.
  if (!in_array($currentTag->name, $tagNames)) {
      $tagNames[] = $currentTag->name;
  }
}

// Break the names of the the tags into a '|' delimited string.
$tagNameString = implode('|', $tagNames);

// Clean up the string so any trailing pipes are removed.
$tagNameString = rtrim($tagNameString, '|');

01-array-functions.php

<?php

// Seperate each indidivudal entry by a '|'
implode(
  '|',
  // Remove any duplicates in the array.
  array_filter(
    /* iterate through the list of tags and add the names to an 
     * array that's returned to filter.
     */
    array_map(function ($tag) {
      return $tag->name;
    }, get_the_tags())
  )
);