Hello!
Sorry, I'm using Google translator.
Please tell me how to fix warnings on php7 and higher
Warning: strtolower() expects parameter 1 to be string, array given in /oc-content/plugins/cache/functions.php on line 277

Let me check that

@buninsan
In file:
oc-content/plugins/cache/functions.php

Find:
$output .= strtolower($n) . '-' . strtolower($v);
change to:
$output .= @strtolower($n) . '-' . @strtolower($v);

Thank!