MAPS add tags to posts - wrapped in CLI command

maps_tags.php

<?php

class MAPS_Tags extends WP_CLI_COMMAND {

	function __invoke() {

		$lines = file( dirname(__FILE__) .  '/tags.csv', FILE_SKIP_EMPTY_LINES | FILE_IGNORE_NEW_LINES );

		foreach ( $lines as $line ) {
			$line = str_getcsv( $line );

			// Vars.
			$search_term = $line[0];
			if ( "Search Term" == $search_term ) {
				echo 'skipping first row' . "\n";
				continue;
			}

			$tags        = explode( '|', $line[1] );

			$args = array(
				's'              => $search_term,
				'post_type'      => 'post',
				'post_status'    => 'any',
				'posts_per_page' => -1,
				'fields'         => 'ids',
			);

			$posts = get_posts( $args );
			echo 'Posts: ';
			foreach ( $posts as $post ) {
				foreach ( $tags as $tag ) {
					$term_id = false;

					$term = get_term_by( 'slug', sanitize_title( $tag ), 'post_tag' );

					if ( $term ) {
						$term_id = (int) $term->term_id;
					} else {
						$new_tag = wp_insert_term(
							$tag, // the term
							'post_tag', // the taxonomy
							array(
								'slug' => sanitize_title( $tag )
							)
						);

						if ( ! is_wp_error( $new_tag ) ) {
							$term_id = (int) $new_tag['term_id'];
							echo 'New tag created: ' . $tag . "\n";
						}
					}

					if ( false !== $term_id ) {
						wp_set_object_terms( $post, array( $term_id ), 'post_tag', true );
						echo 'Tag ' . $tag . ' added to post ID ' . $post . "\n";
					}
				}
			}
		}
	}
}
WP_CLI::add_command( 'maps-tags', 'MAPS_Tags' );