add post meta wordpress code code example

Example 1: add post meta wordpress

<?php

$post_id = 1;
$meta_key = '_test';
$meta_value = 'this is a test';
$unique = true;

add_post_meta( $post_id, $meta_key, $meta_value, $unique );

Example 2: wordpress link post tags

$posttags = get_the_tags();
if ($posttags) {
  foreach($posttags as $tag) {
    echo '<a href="' . get_tag_link($tag->term_id) . '">' . $tag->name . '</a>';
  }
}