How to set ipv6 address as siteurl?

Question

I think your problem here is the esc_url() function which is used to sanitize a lot of the URLs used in wp-core.

If you have a look at the function definition in formatting.php you’ll see that the regex in line 2627 is filtering out [ and ].

But fortunately you can also see that in line 2656 there is a filter supplied which allows you to overwrite this behavior. So you’ll be able to fix this through attaching a custom function to the clean_url filter.

** EDIT2 **

It seems like redirect URLs are sanitized in another function. Fortunately this is a pluggable function, so we are able to overwrite it. I edited the code to take this into account. You can use the following code snippet through creating a mu-plugins folder inside your wp-content folder and placing a PHP file (I named mine fix_ipv6_siteurl.php) inside that folder.

<?php

add_filter('clean_url', 'wpse_120978_custom_esc_url', 10, 3);

function wpse_120978_custom_esc_url( $url, $original_url, $_context ) {

    if( !strpos($original_url, '[') ) {
        return $url;
    }

    $url = $original_url;

    if ( '' == $url )
            return $url;
    $url = preg_replace('|[^a-z0-9-[]~+_.?#=!&;,/:%@$\|*\'()\\x80-\\xff]|i', '', $url);
    $strip = array('%0d', '%0a', '%0D', '%0A');
    $url = _deep_replace($strip, $url);
    $url = str_replace(';//', '://', $url);
    /* If the URL doesn't appear to contain a scheme, we
        * presume it needs http:// appended (unless a relative
        * link starting with / or a php file).
        */
    if ( strpos($url, ':') === false &&
            substr( $url, 0, 1 ) != "https://wordpress.stackexchange.com/" && substr( $url, 0, 1 ) != '#' && !preg_match('/^[a-z0-9-]+?\.php/i', $url) )
            $url="http://" . $url;

    // Replace ampersands and single quotes only when displaying.
    if ( 'display' == $_context ) {
            $url = wp_kses_normalize_entities( $url );
            $url = str_replace( '&amp;', '&#038;', $url );
            $url = str_replace( "'", '&#039;', $url );
    }

    if ( !is_array($protocols) )
            $protocols = array ('http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn');
    if ( wp_kses_bad_protocol( $url, $protocols ) != $url )
            return '';

    return $url;
}


if ( !function_exists('wp_sanitize_redirect') ) :
/**
 * Sanitizes a URL for use in a redirect.
 *
 * @since 2.3
 *
 * @return string redirect-sanitized URL
 **/
function wp_sanitize_redirect($location) {
    $location = preg_replace('|[^a-z0-9-[]~+_.?#=&;,/:%!]|i', '', $location);
    $location = wp_kses_no_null($location);

    // remove %0d and %0a from location
    $strip = array('%0d', '%0a', '%0D', '%0A');
    $location = _deep_replace($strip, $location);
    return $location;
}
endif;

(The previous code from the functions.php can be removed.)

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