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.
