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Hi,
I would some advice on how to roll back to PHP 7 because a recent WP core update to version 4.7.3 has resulted in my NextGEN Gallery plugin generating the following warning…
‘Warning: call_user_func_array() expects parameter 1 to be a valid callback, no array or string given in /data07/mysite/public_html/wp-includes/class-wp-hook.php on line 298’
The plugin authors say that downgrading from PHP 7.1 to PHP 7 will stop the warning, but they don’t actually tell you how to do this!
Can someone please advise on how to roll back to PHP 7?
Many thanks