redirect_guess_404_permalink

Attempts to guess the correct URL based on query vars.

Description

(false|string) redirect_guess_404_permalink();

Returns (false|string)

The correct URL if one is found. False on failure.

Usage

if ( !function_exists( 'redirect_guess_404_permalink' ) ) { 
    require_once ABSPATH . WPINC . '/canonical.php'; 
} 
 
  
// NOTICE! Understand what this does before running. 
$result = redirect_guess_404_permalink();

Defined (1)

The function is defined in the following location(s).

/wp-includes/canonical.php

function redirect_guess_404_permalink() { 
    global $wpdb; 
 
    if ( get_query_var('name') ) { 
        $where = $wpdb->prepare("post_name LIKE %s", $wpdb->esc_like( get_query_var('name') ) . '%'); 
 
        // if any of post_type, year, monthnum, or day are set, use them to refine the query 
        if ( get_query_var('post_type') ) 
            $where .= $wpdb->prepare(" AND post_type = %s", get_query_var('post_type')); 
        else 
            $where .= " AND post_type IN ('" . implode( "', '", get_post_types( array( 'public' => true ) ) ) . "')"; 
 
        if ( get_query_var('year') ) 
            $where .= $wpdb->prepare(" AND YEAR(post_date) = %d", get_query_var('year')); 
        if ( get_query_var('monthnum') ) 
            $where .= $wpdb->prepare(" AND MONTH(post_date) = %d", get_query_var('monthnum')); 
        if ( get_query_var('day') ) 
            $where .= $wpdb->prepare(" AND DAYOFMONTH(post_date) = %d", get_query_var('day')); 
 
        $post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE $where AND post_status = 'publish'"); 
        if ( ! $post_id ) 
            return false; 
        if ( get_query_var( 'feed' ) ) 
            return get_post_comments_feed_link( $post_id, get_query_var( 'feed' ) ); 
        elseif ( get_query_var( 'page' ) && 1 < get_query_var( 'page' ) ) 
            return trailingslashit( get_permalink( $post_id ) ) . user_trailingslashit( get_query_var( 'page' ), 'single_paged' ); 
        else 
            return get_permalink( $post_id ); 
    } 
 
    return false; 
}