Ticket #20582: hide-if-no-customize.php

<?php

function hide_if_no_customize() {
        if ( $GLOBALS['is_IE'] && is_multisite() &&
                preg_match( '/MSIE (\d+)\./', $_SERVER['HTTP_USER_AGENT'], $matches ) && $matches[1] < 10 ) {

                $home = preg_replace( '|^.+://|', '', get_home_url( get_current_blog_id() ) );
                $adminurl = preg_replace( '|^.+://|', '', admin_url() );

                if ( stripos( $adminurl, $home ) !== 0 ) {
                        // domain mismatch
                }
        }
}