301s - WP Include File

301s.php

<?php

$url = get_home_url();

// map redirects in array: [old url (path)] => [new url ($url + path)]
$redirect_urls = array(
    // ''  => $url . '',
);

/**
 * page_redirects
 * Custom 301 redirects.
 *
 * @method page_redirects
 *
 * @author Peter Wegren <peter @ paper-leaf.com>
 *
 * @return [null]
 */
function page_redirects() {
    global $redirect_urls;

    $request = $_SERVER['REQUEST_URI'];

    $request_explode = explode('&', $request, 2);
    $request_trimmed = $request_explode[0];
    $request_remainder = array_key_exists(1, $request_explode) ? $request_explode[1] : false;

    if ( $request_remainder ) {
        $request_remainder = '&' . $request_remainder;
    }

    if ( array_key_exists( $request_trimmed, $redirect_urls ) ) {
        $destination = $redirect_urls[ $request_trimmed ];
        header( 'Location: ' .$destination .$request_remainder, TRUE, 301 );
        exit;
    }
    unset( $redirect_urls );
}
add_action('init', 'page_redirects');