Wordpress duplicate post meta function

duplicate-post-meta.php

function copy_post_meta($base_post,$post_id){
  $new_meta = get_post_meta($base_post);
  foreach ($new_meta as $key => $value) {
    $new_value = maybe_unserialize($value[0]);
    update_post_meta( $post_id, $key, $new_value );
  }
}

wp-cli duplicate post meta

function copy_post_meta($base_post,$post_id){$new_meta = get_post_meta($base_post);foreach ($new_meta as $key => $value) {$new_value = maybe_unserialize($value[0]);update_post_meta( $post_id, $key, $new_value ) ;}}