php – Erro of syntax without wordpress

Meu site esta fora do ar

WordPress erro: HTTP ERROR 500

[29-Nov-2018 18:14:24 UTC] PHP parser error: syntax error, "text & # 39; unexpected (T_STRING) in /home/mysite/public_html/wp-includes/class-oembed.php on line 421

Esta ed Line 421 do calss-oembed.php:

                                // Strip 
        if ($ html_head_end = stripos ($ html, & # 39;& # 39;)) {
$ html = substr ($ html, 0, $ html_head_end);
}

How to solve this problem?