MAPS add tags to posts

maps_tags.php

<?php

$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];
	$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 );

	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'];
				}
			}

			if ( false !== $term_id ) {
				wp_set_object_terms( $post, array( $term_id ), 'post_tag', true );
			}
		}
	}
}