This plugin does not support PHP7

in file wp-code-higlight.php on line 67 just remove function preg_replace… with this:

return preg_replace_callback('/<pre(.*?)>(.*?)<\/pre>/is',
                function ($m) {
                        return  "<pre class=\"wp-code-highlight prettyprint$line_numbers\">".$m[2].'</pre>';
                }, $content);

Problem is that wp-code-higlight is using /e modifier for regular expression which is not longer supported in PHP 7.