wp_old_slug_redirect()

Redirect old slugs to the correct permalink.


Description Description

Attempts to find the current slug from the past slugs.


Source Source

File: wp-includes/query.php

function wp_old_slug_redirect() {
	if ( is_404() && '' !== get_query_var( 'name' ) ) {
		global $wpdb;

		// Guess the current post_type based on the query vars.
		if ( get_query_var( 'post_type' ) ) {
			$post_type = get_query_var( 'post_type' );
		} elseif ( get_query_var( 'attachment' ) ) {
			$post_type = 'attachment';
		} elseif ( get_query_var( 'pagename' ) ) {
			$post_type = 'page';
		} else {
			$post_type = 'post';
		}

		if ( is_array( $post_type ) ) {
			if ( count( $post_type ) > 1 ) {
				return;
			}
			$post_type = reset( $post_type );
		}

		// Do not attempt redirect for hierarchical post types
		if ( is_post_type_hierarchical( $post_type ) ) {
			return;
		}

		$query = $wpdb->prepare("SELECT post_id FROM $wpdb->postmeta, $wpdb->posts WHERE ID = post_id AND post_type = %s AND meta_key = '_wp_old_slug' AND meta_value = %s", $post_type, get_query_var( 'name' ) );

		// if year, monthnum, or day have been specified, make our query more precise
		// just in case there are multiple identical _wp_old_slug values
		if ( get_query_var( 'year' ) ) {
			$query .= $wpdb->prepare(" AND YEAR(post_date) = %d", get_query_var( 'year' ) );
		}
		if ( get_query_var( 'monthnum' ) ) {
			$query .= $wpdb->prepare(" AND MONTH(post_date) = %d", get_query_var( 'monthnum' ) );
		}
		if ( get_query_var( 'day' ) ) {
			$query .= $wpdb->prepare(" AND DAYOFMONTH(post_date) = %d", get_query_var( 'day' ) );
		}

		$id = (int) $wpdb->get_var( $query );

		if ( ! $id ) {
			return;
		}

		$link = get_permalink( $id );

		if ( get_query_var( 'paged' ) > 1 ) {
			$link = user_trailingslashit( trailingslashit( $link ) . 'page/' . get_query_var( 'paged' ) );
		} elseif( is_embed() ) {
			$link = user_trailingslashit( trailingslashit( $link ) . 'embed' );
		}

		/**
		 * Filters the old slug redirect URL.
		 *
		 * @since 4.4.0
		 *
		 * @param string $link The redirect URL.
		 */
		$link = apply_filters( 'old_slug_redirect_url', $link );

		if ( ! $link ) {
			return;
		}

		wp_redirect( $link, 301 ); // Permanent redirect
		exit;
	}
}

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Changelog
Version Description
2.1.0 Introduced.


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